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Huben  Huben GK1 tuning

Can anyone help me out with a basic starting point or tune for H&N 31Gr (.25cal). When I purchased the huben through airgun tactical it cam with 44gr heavies. They stated in the paperwork that the heavys required the screw to be all the way out at max to work properly. It runs flawless however i would like to experament with some lighter slugs and try and get my shot count up a bit. I have some H&N Grizzly 31GR on hand. I have a chrono but not with me and was wondering if i should just dial the screw in 1/2 a turn at a time until i loose functionality or what would be the best place to start without shooting for a specific chrono speed?
Not sure it was mentioned, but the Huben in .25 generally needs a slug sized for .254. Not sure what slugs you are shooting - but I'd check to confirm that. The H&N Grizzlies may or may now shoot well from the Huben - you're going to have to test this out - and I wouldn't do it in the field.

In regards to the current tune - it sounds like you are wasting a lot of air each shot. I have my .25 tuned for the Altaros 6.46mm 51gr slugs shooting @ 900 fps for around 90 fpe. With that I can get a full mag plus a little more from a ~275 bar fill down to reg @ 19mPa.

When you do tune for a 31gr slug I would drop the reg pressure to around 15mPa and start testing from there. There are mentions in the manual (https://www.newenglandairgun.com/uploads/3/4/5/3/34532711/huben_k1_manual__8-25-2021_.pdf) on Page 8 for starting reg pressure and power wheel settings for different weight projectiles.
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Sheridan  C series in brass finish

I have a weaver that was given to me. It doesn't have any cross hairs? I guess they're in there somewhere. 😁
Vintage Weaver K, V, and J series can be serviced/restored and purchased. They even have K series parallax adjusted for rimfire available.
No, they don't do Hakko. They do offer services for some other vintage domestic scopes.

N/A  What's more important to you Max Power or shot cycle?

I ask because I have weighted late model Hw95K 22 barrel from a HW95 field pro I bought a couple years ago. Depending on the gun the barrel makes about 1-1.5 fpe less than it should for reasons unknown to me. That's on any gun I put it on, so there's definitely something up with this barrel. The barrel is still very accurate on any rifle I put it on. It doesn't seem to hurt the rifles shot cycle at all. It just annoys me that its not making full power. I don't need it for pesting should I just get over it and use it? What would you do with it?
Hey Ron,
Assuming you don't loose accuracy, tuning the gun down for an ideal shot cycle is always preferred by me.
As an example, my .177 HW95 with ARH Hornet spring / max spacing can achieve 910 fps (14.5 fpe) with 7.9 CP's. This has been my most accurate pellet.
However, the shot cycle feels/sounds strained. After clipping a coil and reducing spacing, the same gun achieves 880 fps (13.6 fpe) , a relaxed shot cycle, with the same accuracy.

I don't know why I would ever consider this de-tuned shot cycle inferior in any way as you have only lost 3+% of your power.
I know, I wouldn't shoot the gun as much with the harsher cycle (it would bug me) and the extra platform stress would likely result in increased parts failure.

PS: Enjoy the gun and don't worry about the crony stats ;)
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Window Weight Pellet Trap / Backstop

I installed windows for 22 years. I have never seen flat weights in windows, the windows we took out were always round cast iron weights.
I could never figure out what to re use them for.

Great find and re purpose !
I use the round one's to hold the fitted tarp cover on my boat ,
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Veyron Scopes You Need, How to Pick?

Is the 10x44 still a more user friendly version than the 10x30. Eyepiece sounded troublesome.
I see you tagged my previous comment, but they didn't say anything. So I assume this is directed towards me. The 10x44 has an eye box like any other scope. It's not like the zero eye relief 10x30.

Air Arms  Can a ProSport be safely decocked?

@853_OKG - I can verify that this works. It is a bit tedious, as you said. But it works. I'm going to have to make me a little tool or gadget of some sort to streamline the process. I have a few ideas, but if you have any suggestions or further info that might be helpful, I'd love to hear more.

This makes me exceedingly happy. Many thanks again!
Sorry for not replying to your earlier post. I'm super busy with work. I'm glad to hear you figured it out. I've considered making a tool as you suggested, but after you do it a few times and get the hang of it it's not too difficult to do wih just my finger.

AEA 18.3 grain pellets

My Stoeger Bullshark in 22 is not pellet picky. I shot a 194 in the 30 yard challenge with it using Crosman 14.3 grain domed pellets. I shot a 198 with JSB 18.1s. I've shot at least a 195 with FX 18.1s. But just to try something new I ordered a small tin of AEA 18.3s earlier this month and I have been shooting them. My scores were 197, 196, 200 (first this year), 195, 194. Then I cleaned the barrel, it was very dirty, and then shot two 199s (one a masters target), I was hoping for another 200 but I am very happy with these results. So I bought two more big tins and they arrived today. Unfortunately my best target scope is now refusing to hold zero but the initial 3 shot group, while to a different point of impact, was nice and small. Early attempts at another target were going fine until they weren't. I will probably be sending the scope back to Athlon but they replaced the last one without issue and pretty quickly and the replacement had been working very well. But the thread is about these pellets and I am very pleased with them. I don't think I've shot 7 groups in a row 194 or better with any pellet or gun before. But they don't really weigh 18.3 grains according to my scale. I weighed more than 10 from two different tins and they are consistently 18.1 grains. Not an issue, just an observation.

I also bought a tin of the 21.9 grain for my P35-22 that likes H&N 21.14 grain, preferably Match. The scope on that gun fogged up when I took it outside and it's starting to get dark so I quit after 4 shots. Chronograph decided it needs charged too. The first shot was a little low and the next three went into a nice small group at about the elevation of the H&N but a little left. Maybe 2-3 clicks. The similar POI is nice but the important thing is they seem to want to shoot. Hopefully I will get a chance to test them tomorrow.

I also want to try the 18.3s in my Caiman X and probably the P35-22 too. If you have not tried AEA pellets I would. The little tins of 250 are only about $10.

Tuning  Notos tuning HELP

Thanks a lot to all for your hints and help!
Finnaly got the parts (hammer weight and valve) and had the time to upgrade.
Now everything works really nice!
I have around 18.5 fpe with about 2100psi - And the best accuracy on point with JSB Hades .177.
So I'm really happy with the result.

I changed also the side lever and it's nice!
Next step will be now modified inner parts for the original moderator.

It is like a lot of you mentioned - Don't beginn with the mods... It will not end
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Daystate  Daystate Mk3 firing valve

I am currently rebuilding an old Daystate Mk3 and the firing valve has seen better days. It appears to have been skimmed in a lathe and the diameter reduced, presumably to clean up damage.
Do any members know the correct diameter as from the factory? I am considering making a replacement from scratch if too much metal has been removed.

Thanks in advance

How Did You Get Started - Tell Your Story!

Not much differently than many others. My parents were products of the Depression and WWII. They both were hunters, my mother enjoyed rabbit hunting. I still have her .22s. Uncle Bob told me she was the best shot of them all.

We moved from Southern CA to North Alabama in '65...and suddenly instead of sidewalks, I had miles of cotton fields, woods and swamps to explore. I got a Daisy BB gun that Xmas...couldn't cock the lever. By summer, I had built up the strength. By the next year, I graduated to a Crosman 760. I was given the firearms safety lecture and "no songbirds". I had a helluva great childhood, nearly causing a local extinction event for starlings and sparrows.

In the 1980s, I inherited the family firearms (Dad was killed in an accident). I joined a club and started shooting NRA and DCM events. I stopped in 2003, mothballing everything: reloading, casting, etc.

Retired in 2019, moved to the beach. 4 bird feeders over the past 5 yrs have brought in enough squirrels to have done serious damage to the house...bad enough that my wife (normally opposed to any sort of cute animal extermination) said "take them out, I'll buy the pellet gun."

After some research, I bought a .25 Mrod...last May. The tree rat tally on the fridge stands at XCIX (99) today.

A tuning story

My non "goof off" time this morning has been spent shooting and tuning my Stoeger Bullshark in 22 caliber. The wind was very low before 8am this morning so I decided to try another target with the AEA 18.3 grain pellets it likes. The weather report says it was only about 2mph. I shot a three shot group I will post (it's on the left in the picture) and it was a great little one hole group. So I was excited to see if I could get a 200 on the 30 yard Master target. Instead I shot a 195 with 17Xs, That might be my highest X count this year but the 7 is a concern as are the two 9s. Even more of a concern is the 40 fps velocity variation over the 20 shots. I noticed previously that I had to adjust my point of aim with this gun during the target but I was not measuring velocity then and did not know why, The chronograph explains the need to adjust. I then shot a much more raged one hole group on the right of that photograph with the hammer spring increased half a turn. I was trying for a simple retune. Group isn't too good so I decided I need to do a real tune.

I grabbed a tin of FX 18.1 grain because I have very few AEAs (I'm out right now but more are to arrive today) and the bullshark shoots them pretty well. I went up 2.25 turns of the hammer spring screw to it's maximum setting and velocity increase to 920 fps. On the 195 target it went from 837 to 877. On the warm up shots it was as low as 815. So I expected it to go up with more hammer spring but the amount was a bit of a surprise. The last 1/4 turn hammer spring actually decreased velocity establishing the 920 as the absolute peak. So I calculated 95% of that to get 875 and backed off the hammer spring enough to get about there. I shot 3 shot groups at this setting and up a little and down a little from that point. I ended up going down a little, like 1/8th turn, from that setting but the resulting velocity it's at now is very close to 875 average. At the end I switched back to AEA 18.3s which gave me a little higher velocity and I tested a bit but ended up lowering the hammer spring 1/8th turn which brought them down to about 875. Then I shot a 30 yard challenge target with them at this setting. Velocity variation on that target was from 867 to 888 fps. ES about half what it was on the 195 target. I got a 199 16X. Wind had increased to 4mph which is still low but was enough I was adjusting my POA for it but the velocity variation was minor enough I don't think it affected the point of impact at 30 yards. My other SPA guns have had lower ES than this but it may also settle in some with more shooting. I'm happy to have found a tune that is accurate without a high ES.

bullshark warmup.jpg


bullshark 195 17X.jpg


bullshark 199 16X.jpg

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