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My adventure using a RAW HM1000X for NRL22

Not my most imaginative title, but I just mowed the yard in 100 degree heat, so I don't have the bandwidth to be clever.

The background
I've been competing in NRL22 for about a year and a half using a rimfire rifle. I qualified for the 2025 National Championship in Open class but I couldn't travel to BF Washington so I declined. I've won a few monthly matches, so I would say I know what I'm doing (I just can't always do what I know I should be doing).

More background
I've been shooting FT and EFT for 10+ years. I've had some good GP finishes, but I haven't taken it very seriously. I actually started shooting FT because I wanted to do it as practice for PRS. Due to life-stuff, it took me a decade before I got around to shooting PRS, and it's so much more interesting, I haven't been shooting FT.

Enough background, let's talk goals
The NRL National Championship for 2026 is going to be in Alabama, which is drivable for me, so I'm planning to shoot it. I'm not good enough to think I can be in the top 10 in Open or Base class, so I decided to qualify in Air Rifle class. Based on last years scores, I think I need to shoot 88% or better in 6 monthly matches to get an invite to Nationals.

The gun
I pondered what to shoot for a while and I decided to give a little local company a shot. So I received a RAW HM1000X in .22 in May. At the time due to the old NRL air rifle rules, a .22 made sense but with the new rules, I think a .25 would have been a better choice. But I've got a .22, so that's what we'll roll with. It was supposed to come in an MPA chassis, but apparently MPA is not returning our calls so we're rocking the factory chassis. It has the big plenum and the dual hammer spring that comes with the big bore guns. The butt stock is the Luth-AR MBA butt stock and I'm using the MPA EVG grip. I've added about 5 pounds of weight and a long Arca rail to the front, balance is perfect. Topping it off is a Discovery ED-PRS Gen 2. I chose this scope because it's heavy and has huge elevation range.

The tune
The good thing about the HM1000X is that it's bullet proof once you get it set up for a projectile and velocity. The bad thing about the HM1000X is getting it setup for a projectile and velocity. My last high-end PCP was a Delta Wolf, so I'm used to having micro-control over the hammer behavior and regulator pressure. So you can imagine some of the cuss words I invented when I had to de-gas and disassemble the rifle every time I wanted to adjust the regulator. And with no gauge to tell me what the adjusted pressure is, I was flying blind. I eventually settled on a pressure that turned out to be 180 bar as determined by my local RAW expert. Note that the rifle came setup for MRD pellets, which it shot great, but I'm not shooting pellets out to 100 yards in the wind. So now we are diving down the rabbit hole of slug testing.

The ammo
I'll make a long (and ongoing) story short and tell you about the 3 slugs that are working the best. Not great, but the best out of what I've tested so far. All slugs are .217 and lubed with Ballistol.

3rd place is the ZAN 33 grain slugs shooting about 975 FPS. The main issue with these is consistency. They will shoot a great group one day, and fall apart the next day.

A close second place is the H&N Heavy 34 grain slugs shooting 987 fps. They also shoot decent groups at 998 fps, but the shot cycle feels strained and jumpy.

First place is the H&N Precision 33 grains at 1001 fps. I tested these initially and I wasn't super impressed compared to the H&N Heavies, but I was running low on the Heavies so I shot the Precision slugs today with the same tune as the Heavies. Lowering the hammer spring by 1/8 of a turn really tightened the Precision slugs up, so I'm planning to shoot these at the next match.

So where we are right now is a reg pressure of 180 bar and a hammer spring turned out from lockup 1 5/16 turns shooting H&N Precision 33 grain slugs at 1001 fps with an SD of 1.6.

Side note: The Athlon Rangemaster chrono is a game changer for air rifle tuning. I 3d printed a base for it so I can attach it to my Arca rail, so there's no excuse to not know the velocity of every shot.

The progress
The first match of the 2026 season was in May. I was out of town for my match (3rd Sunday, 10am at the Arlington Sportsmen's Club, come on out) so I had to make the 3 hour trek to Abilene. The Abilene matches are usually pretty windy and they don't have a lot of protection, so it wasn't a great time for a halfway tuned air rifle. I was shooting the Zan 33grs, and they were probably shooting around 2 MOA. I wound up with 37.77 points with a score of 170 (your score divided by the high score), but I learned some stuff.

June match was at my club. I was a little more prepared, the Zans were shooting around 1.5 MOA. But the day before I shot in a huge PRS rimfire match that took 12 hours in the Texas heat. Come Sunday, I was cooked and the Give-A-Crap meter (TM) was way in the red. I squeaked out a 63.84% (302.2 score), but I seem to recall making a lot of mental errors.

The July match was last Sunday. I shot a small PRS match the day before and did pretty good, so I felt good for the Sunday match. I had a good tune for the H&N 34gr heavys that was shooting just over 1 MOA at 50 and 100 yards. I did pretty good except for one stage. Stage 3 had two small KYL targets at 40 yards and two medium KYL targets at 63 yards and a 2.5" target at 98 yards. I missed all 8 shots at the KYL targets. I was hitting left, and I stubbornly refused to make a bold correction. After the stage, I checked my zero and I was .3 mil left, so I don't think it was a wind issue. But regardless, if I would have made centimeter corrections instead of millimeter corrections, I would have hit 6 of the 8 targets, which would have won the match. I wound up with 87% (412.5 score) and a coulda-woulda-shoulda for the other 13 points. But that's progress!

I'm currently 7th in the country for Air Rifles, but once the big boys get six scores posted I'll be racing for the bottom if I don't get some better scores.

What's Next?
I'm planning to shoot the Abilene match this Sunday. I don't think I'll be able to top 87%, but I need more time on the gun, especially in tricky winds. (Your highest monthly score is used for the National Leaderboard).

I'm interested in trying the new Zan ELR slugs, I probably need to see if they will fit in the QD Fox mags I'm using. I tried the Altaros 32 grain slugs, they didn't group well for me.

I can't think of anything I need to do with the gun right now. I had the probe get stuck in the retracted position yesterday, so I took it out of the gun, blasted it with gun scrubber and oiled it. It's working fine now.

I'm waiting for Shooters Global to come out with their new level and timer combo unit. the SG Pulse Pro. They need to hurry up and take my money!

If you have any questions about why I'm doing something or not doing something, let me know.

Here's some photos. I'll post my thoughts after the Abilene match.

raw1.jpg


raw2.jpg


slug1.jpg

50 yard groups, 5 mph switchy wind

slug2.jpg

Also 50 yards, windier but less switchy
 
Quick update. I went to a club where I'm going to shoot a PRS rimfire match tomorrow to check the dope on a new lot of rimfire ammo. This guy I know that used to be a good shooter (Hi Jeff) lent me a Tract Toric, so I brought the RAW to zero it. The RAW was hammering small targets from 100 to 250 yards. Easily sub-moa. The zero groups at 50 yards were still not amazing. It appears that shooting the slugs at a fairly high speed is not giving the slugs a chance to stabilize until around 75 yards due to the twist rate of the barrel. For future slug testing, I'll put more emphasis on 100 yard groups rather than 50 yard groups.
 
Not my most imaginative title, but I just mowed the yard in 100 degree heat, so I don't have the bandwidth to be clever.

The background
I've been competing in NRL22 for about a year and a half using a rimfire rifle. I qualified for the 2025 National Championship in Open class but I couldn't travel to BF Washington so I declined. I've won a few monthly matches, so I would say I know what I'm doing (I just can't always do what I know I should be doing).

More background
I've been shooting FT and EFT for 10+ years. I've had some good GP finishes, but I haven't taken it very seriously. I actually started shooting FT because I wanted to do it as practice for PRS. Due to life-stuff, it took me a decade before I got around to shooting PRS, and it's so much more interesting, I haven't been shooting FT.

Enough background, let's talk goals
The NRL National Championship for 2026 is going to be in Alabama, which is drivable for me, so I'm planning to shoot it. I'm not good enough to think I can be in the top 10 in Open or Base class, so I decided to qualify in Air Rifle class. Based on last years scores, I think I need to shoot 88% or better in 6 monthly matches to get an invite to Nationals.

The gun
I pondered what to shoot for a while and I decided to give a little local company a shot. So I received a RAW HM1000X in .22 in May. At the time due to the old NRL air rifle rules, a .22 made sense but with the new rules, I think a .25 would have been a better choice. But I've got a .22, so that's what we'll roll with. It was supposed to come in an MPA chassis, but apparently MPA is not returning our calls so we're rocking the factory chassis. It has the big plenum and the dual hammer spring that comes with the big bore guns. The butt stock is the Luth-AR MBA butt stock and I'm using the MPA EVG grip. I've added about 5 pounds of weight and a long Arca rail to the front, balance is perfect. Topping it off is a Discovery ED-PRS Gen 2. I chose this scope because it's heavy and has huge elevation range.

The tune
The good thing about the HM1000X is that it's bullet proof once you get it set up for a projectile and velocity. The bad thing about the HM1000X is getting it setup for a projectile and velocity. My last high-end PCP was a Delta Wolf, so I'm used to having micro-control over the hammer behavior and regulator pressure. So you can imagine some of the cuss words I invented when I had to de-gas and disassemble the rifle every time I wanted to adjust the regulator. And with no gauge to tell me what the adjusted pressure is, I was flying blind. I eventually settled on a pressure that turned out to be 180 bar as determined by my local RAW expert. Note that the rifle came setup for MRD pellets, which it shot great, but I'm not shooting pellets out to 100 yards in the wind. So now we are diving down the rabbit hole of slug testing.

The ammo
I'll make a long (and ongoing) story short and tell you about the 3 slugs that are working the best. Not great, but the best out of what I've tested so far. All slugs are .217 and lubed with Ballistol.

3rd place is the ZAN 33 grain slugs shooting about 975 FPS. The main issue with these is consistency. They will shoot a great group one day, and fall apart the next day.

A close second place is the H&N Heavy 34 grain slugs shooting 987 fps. They also shoot decent groups at 998 fps, but the shot cycle feels strained and jumpy.

First place is the H&N Precision 33 grains at 1001 fps. I tested these initially and I wasn't super impressed compared to the H&N Heavies, but I was running low on the Heavies so I shot the Precision slugs today with the same tune as the Heavies. Lowering the hammer spring by 1/8 of a turn really tightened the Precision slugs up, so I'm planning to shoot these at the next match.

So where we are right now is a reg pressure of 180 bar and a hammer spring turned out from lockup 1 5/16 turns shooting H&N Precision 33 grain slugs at 1001 fps with an SD of 1.6.

Side note: The Athlon Rangemaster chrono is a game changer for air rifle tuning. I 3d printed a base for it so I can attach it to my Arca rail, so there's no excuse to not know the velocity of every shot.

The progress
The first match of the 2026 season was in May. I was out of town for my match (3rd Sunday, 10am at the Arlington Sportsmen's Club, come on out) so I had to make the 3 hour trek to Abilene. The Abilene matches are usually pretty windy and they don't have a lot of protection, so it wasn't a great time for a halfway tuned air rifle. I was shooting the Zan 33grs, and they were probably shooting around 2 MOA. I wound up with 37.77 points with a score of 170 (your score divided by the high score), but I learned some stuff.

June match was at my club. I was a little more prepared, the Zans were shooting around 1.5 MOA. But the day before I shot in a huge PRS rimfire match that took 12 hours in the Texas heat. Come Sunday, I was cooked and the Give-A-Crap meter (TM) was way in the red. I squeaked out a 63.84% (302.2 score), but I seem to recall making a lot of mental errors.

The July match was last Sunday. I shot a small PRS match the day before and did pretty good, so I felt good for the Sunday match. I had a good tune for the H&N 34gr heavys that was shooting just over 1 MOA at 50 and 100 yards. I did pretty good except for one stage. Stage 3 had two small KYL targets at 40 yards and two medium KYL targets at 63 yards and a 2.5" target at 98 yards. I missed all 8 shots at the KYL targets. I was hitting left, and I stubbornly refused to make a bold correction. After the stage, I checked my zero and I was .3 mil left, so I don't think it was a wind issue. But regardless, if I would have made centimeter corrections instead of millimeter corrections, I would have hit 6 of the 8 targets, which would have won the match. I wound up with 87% (412.5 score) and a coulda-woulda-shoulda for the other 13 points. But that's progress!

I'm currently 7th in the country for Air Rifles, but once the big boys get six scores posted I'll be racing for the bottom if I don't get some better scores.

What's Next?
I'm planning to shoot the Abilene match this Sunday. I don't think I'll be able to top 87%, but I need more time on the gun, especially in tricky winds. (Your highest monthly score is used for the National Leaderboard).

I'm interested in trying the new Zan ELR slugs, I probably need to see if they will fit in the QD Fox mags I'm using. I tried the Altaros 32 grain slugs, they didn't group well for me.

I can't think of anything I need to do with the gun right now. I had the probe get stuck in the retracted position yesterday, so I took it out of the gun, blasted it with gun scrubber and oiled it. It's working fine now.

I'm waiting for Shooters Global to come out with their new level and timer combo unit. the SG Pulse Pro. They need to hurry up and take my money!

If you have any questions about why I'm doing something or not doing something, let me know.

Here's some photos. I'll post my thoughts after the Abilene match.

View attachment 580774

View attachment 580775

View attachment 580776
50 yard groups, 5 mph switchy wind

View attachment 580777
Also 50 yards, windier but less switchy
where was your aim point in the last picture .
 
@scotton I like how this write up is coming together. It seems that you’re now invested in .22 however, I wanted to ask - have you looked into a .25 bolt kit and barrel for caliber conversion? As I understand it, the HM1000x .25 caliber conversion kit (barrel and probe assembly) costs around $500 including shipping.
I've thought about it, but I would probably be shooting the same weight of slugs in .25, so I'm not sure there's any point in changing right now. The BCs are the same, and I don't want to go through another round of slug testing.
 
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Quick update. I went to a club where I'm going to shoot a PRS rimfire match tomorrow to check the dope on a new lot of rimfire ammo. This guy I know that used to be a good shooter (Hi Jeff) lent me a Tract Toric, so I brought the RAW to zero it. The RAW was hammering small targets from 100 to 250 yards. Easily sub-moa. The zero groups at 50 yards were still not amazing. It appears that shooting the slugs at a fairly high speed is not giving the slugs a chance to stabilize until around 75 yards due to the twist rate of the barrel. For future slug testing, I'll put more emphasis on 100 yard groups rather than 50 yard groups.
I’ve always been baffled by the “not stabilize” until past 50 yards (or whatever distance). What I don’t get is mediocre groups at 50Y, but accuracy and precision improves at past 75Y (or whatever)?

What I don’t get is how a slug that is left, for example, at 50Y knows to redirect slightly right past 75Y, and one that is right knows to go left?
Or, perhaps the groups at 100Y aren’t better than at 50Y but relatively better? That makes a little more sense I guess…
 
I’ve always been baffled by the “not stabilize” until past 50 yards (or whatever distance). What I don’t get is mediocre groups at 50Y, but accuracy and precision improves at past 75Y (or whatever)?

What I don’t get is how a slug that is left, for example, at 50Y knows to redirect slightly right past 75Y, and one that is right knows to go left?
Or, perhaps the groups at 100Y aren’t better than at 50Y but relatively better? That makes a little more sense I guess…
If I had a gun that shot slightly left at 50 and slightly right at 100, I would be confused as well. That sounds like more of a scope issue than a gun issue.

What I'm seeing is 1-1.5 MOA groups at 50 yards and .7-.9 MOA groups at 100 yards and beyond.

When I have time, I'm going to try to tune to the next slower node and see how it groups at 50, 100, 150, 200 and 250. If my theory on the speed causing initial instability is correct, I might see better groups at 50 that gradually degrade at distance. If that's the case, I may shoot slower for NRL22 and speed back up for longer range matches.
 
The Abilene match was a success if the goal was to see how the RAW shoots in terrible, swirly, West Texas winds. On paper, it was a failure, but the score card doesn't tell the whole story.
I've never shot well at Abilene mostly due to the wind, which is why I keep going back. I shot a 321 today, compared to a 412 last week on the same course of fire with much less wind. By comparison, the match winner (who is a very good shooter) shot a 420 today, so it wasn't hard on just me.

Positives -
I hit 4 of the KYL targets that I missed last week.
I did an OK job seeing wind shifts and lulls mid-stage.
My dope was good.

Negatives -
I had a weird double feed that cost me a hit.
I had an almost ND. I hit the trigger with my pinky when closing the bolt. Luckily I was on target and actually hit the target. I need to be more deliberate when closing the bolt, especially when in a hurry.
I struggled to see my impacts, which is something I've been working on lately. At this location, you aren't going to see a miss so you have to get your wind corrections off of hits. I might paint the base of the slugs to see if I can pick up the slugs in flight. I've tried that before with mixed results.
I was wobbly on a couple of positions where I'm usually not wobbly. I dropped 4 shots for sure due to wobble, that's not acceptable on a day where hits are hard to come by.

So I'm going to give the gun an A- today and give myself a solid C. I'm pretty sure I would have shot close to the same score with my rimfire rifle today, which says something about how the gun shot and how I shot.

I have the PRS Rimfire Regionals on Saturday so I probably won't be doing anything with the RAW until after that.
 
I did some more tuning yesterday to see if a lower speed node would group better at 50 yards. This months course of fire has a lot of small targets from 43 to 65 yards, so I want to focus on the closer shots even if I give up a little accuracy at 100 yards.

My method was to start at the most recent tune (180 bar, 1 1/4 hammer spring out from lock up) and shoot 5 shots, then turn the hammer spring out half a turn and shoot another group, etc. I went from 1001 fps down to 925 fps. At 925 fps, the groups really opened up and the SD and ES got pretty bad, so I clearly wasn't getting full air from the valve. So I have my floor and my ceiling. There was a promising group at 960 fps, some from 925 I went up a quarter of a turn on the hammer spring and shot groups until something interesting happened. Around 940 to 960 I started seeing some good groups, but everything over 950 produced flyers. I narrowed it down to 944 FPS, which is 2 3/8 turns out from lock up, or 1 complete turn out from the 1001 fps tune.

At 100 yards, the group was fine, .2 or .3 mils lower than the high speed tune. I think the higher speed tune was a little tighter, but it's good enough for 2.5" targets at 100 yards. If I decide to stay with this lower speed tune, I'll probably turn the reg down a little to get more shots per fill.

I messed around with painting the bases of some slugs to make them more visible in flight. I took some crappy slugs and painted the bases with pearly white nail polish. Then I painted over half of the pearly whites with hooker red (actually it's "Holiday Red", but if you see this at a Christmas party, it will probably be worn by a hooker). I loaded alternating colors in a mag and shot at a dirt berm at 100 yards. The pearly whites were very visible at 12X, the red slugs were not visible at all. So I painted the bases on some of my good slugs with pearly white, next time I go to the range I'll mix some painted slugs in and make sure they group the same.

I also did a little scope swap. My rimfire rifle has been having a weird .3-.5 POI shift after 4 or 5 stages in the last 4 matches. It's either the scope, rings, base, ammo or gun. So to try to figure it out, I put the Tract Toric on the rimfire rifle and the Athlon Midas Tac on the RAW. I also put my big Discovery on my RPR to use as a loaner at my next match. I got everything sighted in with the new glass at 25 yards, and the RAW had a much tighter group than the Bergara or RPR, even with the high speed tune and the slugs that aren't it's favorite. No real commentary on this, I just thought it was weird.

Next step will be more fine tuning at 944ish fps. And apparently I have to shoot field target in a couple of weeks so I need to figure out a gun. I'll probably put the .177 barrel in the Avenge X with the Falcon T50 and shoot Hunter. Or maybe the HW97 WFTF. Nah, it's going to be hot as balls, I don't need to be wearing a jacket or shooting a springer.

Here's a photo of the groups from tuning the H&N Precisions and a photo of the sight in mag dump at 25 yards.

groups hn precision.png
20250806_134702.jpg
 
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I went to the range today to further test the slow node and the fast node. As with most airguns, things can be great one day and terrible the next, so I wanted to test for repeatability.
Unfortunately the range was very busy so I didn't feel like going downrange to hang targets on multiple ranges, so I went with a quick and dirty range session. The result of this is I only took a photo of one target, we'll get to that in a bit.

So the plan was to start with the last slow setting at 50 yards, shoot a couple of groups (after foulers since I cleaned the barrel), then crank the hammer spring up about 1 1/8 turns to 1000 fps and shoot some more groups. Then repeat at 100 yards.

I made one small ammo change, I switched to a different lube. I've been using Ballistol but I wanted to try something else. I have a can of Safari Charlie that I bought at Ray's Sporting Goods in West Dallas about a million years ago, and it has a pleasant scent, so I tried it. When I took the slugs out of the tin at the range, they were bone dry and did not feel lubed at all. They shot ok, but the barrel was dirtier when I was done than it usually is, so I'm going back to Ballistol.

At the range, my initial shots were coming in hot, around 960 fps where they were 944 fps a few days ago. Maybe the heat, maybe the new lube, maybe something else. Regardless, I shot a group and it was meh, so I went ahead and cranked the hammer up to 1000 fps. The groups at 1000 fps were terrible, so I went down 8 clicks on the hammer spring and I was still getting 970-ish fps. I went down 2 more clicks and got very large ES, like 30 fps swings. I started creeping up on the hammer spring until the velocity stabilized, and around 960 fps I got some great 50 yard groups.

I moved to the 100 yard range and I got an adequate group of about 1 to 1 1/4 inch. I also shot some Zans to make sure they still suck. They do. Bummer, I like shooting Zans but if the gun doesn't like them, I'm not going to argue with it.

Then I headed to the 200 yard range and shot the group in the photo. I was pretty pleased with this group, especially since the guy next to me was showering me with brass. At least he was shooting suppressed.

It looks like I need to keep this tune in the rifle, and when I zero before a match I need to microadjust the hammer spring until I get good groups, then just plug that speed into my ballistic calculator. I wanted to shoot at 200 to see if it would be feasible to shoot this rifle in a PRS match this weekend. The match doesn't have an air rifle option, so I would be shooting in Open class. I think I'll go to another club this week where I can practice at long range in the wind and see how it goes.

Here's my 200 yard 5 shot group. Ignore the shot at the bottom left, I couldn't see the impacts so I was spraying shots all over the place to try to see something. Turns out my first 5 shots were actually where I intended, aim point was the center of the target. If you are one of those people that think that 10 shot groups are necessary to measure a gun's accuracy, I would encourage you to send me ammo. But if I'm paying for my own ammo, I'm going to shoot 5 shot groups.

20250810_104714.jpg
 
I wound up not shooting the PRS match with the RAW because I didn't have time to setup DSF numbers in my Kestrel, plus that club doesn't support the Air Rifle division so I would have been shooting in Open class. I shot my Bergara, and I'm still having ammo issues where I'm getting low shots after 5 or 6 stages. Eley Match tends to create little wax boogers in the barrel, so the issue might be fixed by running a patch through the barrel every 3 or 4 stages.

I shot the RAW for my NRL22 match Sunday. The good news is I didn't let Cloud beat me with his RAW. The bad news is I still struggled on the close KYL target stage, I dropped 8 shots on that stage. The really bad news is that one of the other shooters went on an absolute tear, which means I only got 66 points for the match. (In NRL, all of your points are based on the overall winner's score, not the division high score. In PRS, your points are based on the scores within the division). So I'll need to shoot the Abilene match to try to make up some NRL points. The problem is that the guy that usually wins the Abilene match shot a 512.6 to my 351.6, so I'm going to need to pick up some shots and talk him into shooting my Avenge X.

Cloud gave me some of the magic Corbin slugs to try out. If I can get them shooting decent, I'll probably shoot the RAW at the next PRS match. I'll post some groups in a day or two once I get a chance to try them out. I shot a couple of mags Sunday and they did as good or better than the H&N Precisions at 50 and 100 yards at 960 FPS with the hammer spring maxed out. I've added a couple of shims to the hammer spring to see if I can get them up to 980-990 fps. This is with the double hammer spring, not the stock spring. Reg is still set to 180 bar.

Hopefully Wednesday will be testing day, then I can go to the longer range club and set my DSF out to 350 yards on Friday.
 
I stole a couple of tins of the magic Corbin slugs from Cloud, enough for a little testing but not enough to super fine tune if I want to have enough to shoot in a match. I went to the range today to see if I could use these for an upcoming PRS match. Short answer is: Yes.

Here's the long answer.
First thing I did was put the Tract Toric back on the RAW. The Athlon Midas Tac is fine, but the difference in glass quality is noticeable.
I also added a longer steel bar sandwiched between the Arca rail and the chassis. So now I have two 1/4 x 1 1/2 inch steel bars between the Arca and chassis. These are for weight and to add rigidity to the Arca rail, which sticks out halfway to the end of the bottle.
I also added a couple of shims to the hammer spring to try to get a little more speed (Spoiler: I picked up maybe 5 fps, but it shoots dirty with the spring maxed out).

With the hammer spring maxed out I got a 963 FPS average with an SD of 5.3. I took a turn off of the hammer spring and the group tightened up a bit and the SD improved to 2.2, still shooting at 963 fps. I lowered the velocity down to about 950 and gradually increased it back up to about 960 until the 50 yard groups got tight. Then I shot some groups at 100. I had some split groups, with 3 shots touching and two shots touching an inch away. I dropped the hammer spring about a quarter of a turn and the group got more consistent. Then I shot at 200. Groups were ok given the wind.

I was shooting 5 shot groups because I was running low on air in the big tank and I wasn't sure if the 10th shot would be off the reg. On a full fill, I'm getting 14-15 shots on reg with this tune. I thought about turning the reg up a bit, but I feel like I'm already at the limit for shot count so I'll leave it at 180 bar for now.

I was getting some odd numbers in Strelok until I realized that I had set the BC at 1.5 instead of .15. Decimal places matter, who knew? I'm having a little trouble lining up my number from 100 yards and 200 yards, but when I enter the 5 MPH tail wind I was getting they line up a little better. I think my Strelok numbers are good enough to use as a starting point in my Kestrel, then I can set up DSF starting at 150 yards instead of 200 like I would for rimfire bullets.

These slugs are shooting as good or better than anything else I've been using, especially at 100 yards. The fact that they are 40 grain and shooting a little flatter at 100 and 200 yards is great. I think the rifle would benefit from a barrel with a faster twist rate and maybe a couple more inches in length.

I'll report back after the PRS match, hopefully with good news.

raw_corbin.jpg


50 yards
corbin_963_50y_1.jpg
corbin_963_50y_2.jpg


100 yards
corbin_963_100y.jpg
corbin_963_100y_1.jpg
corbin_963_100y_2.jpg


200 yards
corbin_963_200y_1.jpg
 
I'm having a little trouble lining up my number from 100 yards and 200 yards, but when I enter the 5 MPH tail wind I was getting they line up a little better.

Don't use wind in Strelok at anything but full value (90 or 270) degrees. The calculation is wrong. I've told the developer, he doesn't care.

To verify the error... enter no wind. Check the drop table, note your muzzle velocity at 1 yd from muzzle. Now enter a 10 mph head wind (0 degrees). Check the drop table again at 1 yd from muzzle. Does it make sense to you? Sure doesn't to me.

So for your dope issue it's either going to be your muzzle velocity or BC that's causing your error. But that tail wind entry in Strelok is going to throw you off when you go to your Kestrel.
 
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Don't use wind in Strelok at anything but full value (90 or 270) degrees. The calculation is wrong. I've told the developer, he doesn't care.

To verify the error... enter no wind. Check the drop table, note your muzzle velocity at 1 yd from muzzle. Now enter a 10 mph head wind (0 degrees). Check the drop table again at 1 yd from muzzle. Does it make sense to you? Sure doesn't to me.

So for your dope issue it's either going to be your muzzle velocity or BC that's causing your error. But that tail wind entry in Strelok is going to throw you off when you go to your Kestrel.
Thanks, good info. I just plugged my data into the Kestrel and it looks pretty close to what was happening at the range. I'll calibrate it when I go to the match.