BSA BSA R10 SE .22 New spring for higher shot count

[fusion]

Hello All,
I had a big win with a new spring on my BSA R10 SE in .22. The stock setup was getting about 32 shots on the regulator., and I didn't think this was enough, so I started looking at adding a SSG. I had seen some designs of SSG that would work, but they required cutting a hole in the stock at the back the receiver. I really wanted to keep the stock look of the gun. I then started looking into a short stiffer spring that would prevent striker bounce. I evaluated the stock spring in the spring calculation software see attached files for spring data. I then looked at what the bolt motion requirements were, and found that a spring that was 1.5" long should do the trick, and it needed to have a rate of 37 lbs/in. I found this spring on McMaster Carr, part number 94125K211.

This spring drops right in. It was a little snug on the spring guide, but it fit well.
After installing this spring, I adjusted the spring to provide 875 fps with JSB 15.9 grain pellets, and was able to get 50 shots on the regulator. This was my goal, and I am very pleased with the results.
I think the efficiency is almost as good as adding a SSG, and there was no need to modify any part or the stock. The only down side, is the spring is stiffer, and requires more effort to cock the rifle. I'll take that for the increased shot count.

Good luck if you try this modification.
Best regards,
Mike

 

[fusion]

I tried to post pictures of the new and old spring data, but it’s giving me a server error.

 

[CharlieF]

If you really want to increase your shot count, put a larger bottle on it from Best Fittings in UK. I get 120 shooting CPH's at 932 fps.

 

[bchannell]

Im just curious, did you do a proper tune. Find the plateau etc?
I have a mr2 177 tuned to shoot 10.3 gr at ~910 fps and get 62 shots with an es of 10fps with the small bottle. The R10 really responds to tuning. Im not sure, but I think a 22 would go higher on shot count. Before i tuned it, i was getting a similar 30ish shot count.
Great gun! Simple, accurate, beautiful, just kinda out of vogue nowadays, but i could care less about that.
If anyone cares AOA has a used SE cheap.

 

[fusion]

I didn't adjust the regulator before I changed the spring. When I bought the rifle from a forum member, the factor regulator wasn't working, so I replaced it with a Huma regulator. I adjusted the hammer spring to achieve 880 fps with JSB 15.9 pellets and saw about 32 shots in the regulator. I left it like that for about a year, and finally did something about it.

 

[Dr. Kralenstein]

Hello All,
I had a big win with a new spring on my BSA R10 SE in .22. The stock setup was getting about 32 shots on the regulator., and I didn't think this was enough, so I started looking at adding a SSG. I had seen some designs of SSG that would work, but they required cutting a hole in the stock at the back the receiver. I really wanted to keep the stock look of the gun. I then started looking into a short stiffer spring that would prevent striker bounce. I evaluated the stock spring in the spring calculation software see attached files for spring data. I then looked at what the bolt motion requirements were, and found that a spring that was 1.5" long should do the trick, and it needed to have a rate of 37 lbs/in. I found this spring on McMaster Carr, part number 94125K211.

This spring drops right in. It was a little snug on the spring guide, but it fit well.
After installing this spring, I adjusted the spring to provide 875 fps with JSB 15.9 grain pellets, and was able to get 50 shots on the regulator. This was my goal, and I am very pleased with the results.
I think the efficiency is almost as good as adding a SSG, and there was no need to modify any part or the stock. The only down side, is the spring is stiffer, and requires more effort to cock the rifle. I'll take that for the increased shot count.

Good luck if you try this modification.
Best regards,
Mike

Look up the blast tamer mod for the SE guns. It's an SSG basically and it fits under the action inside the stock. No modifications necessary to your stock.

 

[bchannell]

I also installed a Huma in mine. The factory reg looked fine and i resealed it but no joy. The Huma made all the difference in the world. My Huma teg came set at 110 bar, i upped it to 130 iirc and tuned the hammer spring and it was golden.

Is you gun loud, snappy? It should quiet down considerably when you back the hammer down to where its not wasting air after the pellet has left the barrel. Sounds to me like upping the reg and backing down the hammer would yeild similar velocity and less air wasted.

Some guns its hard to hear a difference in sound because of strippers and moderators but my R10 and impact are easy to hear the change. My Katran is difficult to hear

 

[fusion]

My rifle became much quieter with the new spring. It was frustrating before because every shot you could hear a ton of wasted air. Now I think it’s perfect.