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My adventure using a RAW HM1000X for NRL22

Welp, that was a thing that happened. My PRS match went pretty much how I thought it would. I came in first and last place in air rifle division. Actually, it went better than expected, most of the misses were dope issues rather than accuracy issues.

Started out hot with basically low wind. Stage 1 was 175 yard KYL, hit 8 of 10.

Stage 2 was a PRS barricade with targets at 101 and 120. Would have been clean but I forgot to hold on one of the far shots, so 9/10.

Then the wind started to pick up and the scores started to go down.

7/12 on targets at 89, 125 and 165 yards. Dialed the near and middle targets, held the far target. Elevation was off.

3/10 on targets at 132 and 264 yards. Held too much wind on the near, elevation was off on the far. But I did hit a .8 mil target at 264 yards 4 times in a row (unfortunately 2 of the hit were off the clock).

5/10 on an easy stage at 145 yards. Wind was swirly and I held too much of it.

5/10 on a KYL at 217 yards. Held too much wind, I was hammering the smaller targets once I got the wind call.

3/10 on a 60 yard KYL and an easy 100 yard target. I wrote down my holds as .4 and 2.2, so I decided I would dial .4 and hold 1.8 for the far. It was a decent size target at 100 yards, so I got lazy and held 2 mil. But, at 100 yards with the heat it should have been 2.0 mil at 100, not 2.2. So by holding 2 mil with .4 dialed in, I was effectively holding .4 mils too high. The real kicker is I would have had plenty of time to just dial it.

8/12 on a 90 yard KYL. Wind switched halfway through, I made a good adjustment. 8 was actually a good score on this stage.


I had some elevation issues as expected. When I sighted in, I was getting a 2.1 mil hold at 100 yards and 9 mil at 217. According to the Kestrel, these can't both be true. So I need to go out and set a custom curve past 150 yards, I just didn't have a chance to do that before this match.

I was also holding too much wind pretty consistently. Most of my misses during that bad stretch of stages were bad wind holds, so I need to mess around with the BC value once I get my custom curve set up to get better wind holds. Or I might just need to reduce my wind call by 10% every time. I'll figure it out, this is the first time shooting this rifle in any real wind past 100 yards. But other shooters would say they held .5 for wind, and it would be .3 or .4 for me.

The upside is that my score percentage based on the high overall score was the exact same as the last time I shot at this location (70.5%). So if I would have had better elevation and wind data, I would have outperformed my rimfire score from last month.

Other positives:
I discovered that when I put the Tract Toric back on, I had it one slot too far forward on the pic rail. Fixed it.
I discovered that my 7 liter tank has more than enough air for a full match.
I found a way to make my shooting cart more stable.
I discovered that beating rimfire guys with an air rifle feels really good. The "BB gun" jokes really started to fade after the first couple of stages.

I went ahead and ordered the MPA chassis, hopefully it will arrive in about a month. I also pre-ordered the new SG Pulse Pro, this looks even cooler than the unit they demoed a few months ago.

I'll share my method for truing my Kestrel once I figure out what that method is. I'll post some photos in a bit.
 
I've had good luck truing with just BC, given you have an accurate MV and environmentals. I shoot the Altaros and use G7, so you can try that too (you're shooting the ACEs right?). I know people who try too hard with DSF and other advanced truing methods, and end up getting lost in the weeds. At least in my experience that's not necessary.
 
Playing around in Strelok and the Kestrel with MV and BC at known good dope for 90 yards (1.7 mil) and 217 yards (9.0 mil), I got good numbers with an MV of 981 and a BC of .18. Cloud told me he was getting .18 BC with these slugs in his RAW but I had it set at .16 for whatever reason. So this might be a good starting point for my next range session. Oddly enough, with a 9 o'clock 3mph wind at 217 yards, I'm getting .5 wind with RA4, .6 with G1 and .3 with G7. So switching to G7 might fix my wind issues. However, changing to G7 made my elevation drop from 9 mil to 8.2 mil at 217 yards. If I calculate MV for 9 mils at 217 yards, my MV drops to 938.

I need to go put paper out at a bunch of yardages and get some real world dope, then I can figure out how to make the numbers work. I'll see if G1 or G7 gives me better wind values, then I can make my curve based on that.
 
You already know this but just a reminder to always confirm and or correct your zero before you do any dope work. A click off up or down frustrates the dope process.

I double check the zero again throughout the process just to make sure because sometimes a poi shift has happened in which case no wonder my dope wasn't lining up so an hour was wasted.

Even my Anschutz 22rf has shifted on occasion and am not sure why.
 
In case there was any question, zer0dev is a genius. I had a little range sesh to try using G7 in my Kestrel, it worked perfectly. I think the wind values are still high, playing around with the wind and yardages from my match on Saturday I'm getting a bigger wind hold and I was expecting a smaller wind hold.

I think I'm just going to have to do some wind testing and figure out if there is a constant modifier to reduce either the wind input or the wind call output. I don't think I'll have time to shoot in the wind until the Abilene NRL22 match on Sunday, but there will definitely be wind there.

I also put a 700cc tank on the gun. Looks a little crazy, but I think it will look better once I get the MPA chassis. It does add a little heft and moved the balance point forward about an inch, so that's a bonus. Shot count went up to about 22 shots on a 250 bar fill.

156 yard at 5.3 mil
156.jpg


200 yard at 8 mil
200.jpg


B.A.T.
big_tank.jpg


Not crazy about the SD, but I adjusted the hammer spring a bit and sometimes it need to settle in.
chrono.jpg


These numbers worked in Strelok as well, as long as you remember all of the decimal places for the BC.
kestrel.jpg
 
I think the wind values are still high, playing around with the wind and yardages from my match on Saturday I'm getting a bigger wind hold and I was expecting a smaller wind hold.

I think I'm just going to have to do some wind testing and figure out if there is a constant modifier to reduce either the wind input or the wind call output. I don't think I'll have time to shoot in the wind until the Abilene NRL22 match on Sunday, but there will definitely be wind there.

I'm glad you're having some success! Wind calls from any calculator are... suggestions at best. It's going to be accurate if you have consistent wind all the way from your shooting position to the target. No swirls or obstructions, no landscape features. I've almost never found this to be the case. I would bet that's what you're seeing, and you'll probably do best to just get a feel for it with practice. I've never heard any pro shooters talk about truing windage :)
 
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Hah! I just wrote out a novel explaining a bunch of stuff that doesn't need to be explained, and to back up my argument I did a little test that was completely counter to everything I wrote.

I took a COF from a couple of weeks ago that I shot with my rimfire rifle. I took a stage that had a target distance of 213 yards. I had written down a wind of 2-5 mph from 10 o'clock, with a wind bracket of .6 to 1.2 mils. (I chose this stage because I did well on it so the wind call must have been good).
Plugging the same wind into the Kestrel gives me the same .6 to 1.2 wind bracket for the rifle and ammo I was using for that match. When I change to the profile for the RAW shooting the Corbin slugs, the wind bracket is .4 to .7 mils. I spot checked a few other stages and I'm getting the same result, with the Corbins using less wind than the rimfire ammo. This is in line with how much I was over-holding for wind on Saturday, so I think I can trust the G7 wind values until they prove otherwise.

It will take some trigger time, but I feel more confident than I did an hour ago.

And the reason you don't hear rimfire shooters talk about truing their windage is because they don't need to. They have thousands and thousands of data points for their ammo in Applied Ballistics, while we are constantly using different slugs that didn't exist a year ago.

This is exactly why I wanted to switch to air rifle for PRS. I've been in a slump with my rimfire rifle and I was starting to burn out. Now I'm re-invigorated and excited about shooting my next match.
 
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