Huma Reg Edgun Leshiy low shot count questions?

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Jan 7, 2017
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Nebraska, United States
Ok, I installed a huma reg and only getting 27 shots with a .177 cal. The edgun leshiy is in .177 with a 250mm barrel. I decreased the power of the gun and yet the shot count has not gone up that much. I could try to turn this into a 12FPE gun shooting 8.4 jsbs but the trade off just does not seem worth it for lack of shot count. So I am shooting .177 10.3 grains jsb pellets at 800 to 830. Only getting about 27 shots at about 14 to 15 fpe. This seems very low as people have noted the ability to get 20 shots with a huma reg installed in .25 cal with 800 fps which equates to over 30 FPE which is about double the power yet 3/4 shots. Some side notes of the tune. The huma regulator is set to about 95 bar. The gun starts out at 250 bar and runs down to 95 bar. Per other users they indicated filling the gun up to max of 300 bar but that only gets users an extra 2 shots. The gun blows too much air at 300 bar thus users are going to 250 bar. After the gun hits 95 bar the POI impact changes by a few mil dot at 50 yards basically the gun appears to be running out of air. There was another poster on a lehshiy forum that indicated he was getting 33 shots with a .22 cal jsb 13.3 grain at 775 fps. This was with the standard regulator not the improved one. Any help on how to get the gun to shoot efficient ? jay Anybody offer any tips ?
 
Jay,

You say you "decreased the power of the gun". Did you do with by lowering the regulator set point? If so then you also need to reduce the hammer pre-load so that you are no wasting air. A hammer spring tuned for a 120bar setting will be wasting air at a 95bar setting. Once you tune the gun to the new set point your shot count should increase.
 
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BigTin, Ok, i lowered the regulator to 95 bar. I also decreased the hammer spring as well. I was playing with the hammer spring at the regulator set at 95 bar. 

From my reading I thought by increasing/decreasing hammer spring tension I would come across a sweet spot of air usage. I just have not found that yet. 

I might try to increase the regulator then play with the hammer spring as well. What I noticed first off is that if I close down the hammer spring too much the pellet speed drops below 800 fps which in my opinion for a .177 is undesirable low FPE.
A side note I am thinking about putting in the 22 barrel again and seeing what that will do. To be honest I had a .22 barrel in the rifle and was getting 795 fps with the old regulator and was getting almost as many shot that I am now with the new regulator. 
I do not know if there is some type of improved efficiency with a .22 vs a .177 pellet. I am amost willing to bet I could get just as many shots with the rifle now in a .22 at more FPE. 

So, I will play with the hammer spring more but at this point maybe I need to increase the regulator pressure and then go back to the drawing board of spring tension to see if the new bar setting some how gets me better efficiency ?
I am so use to cutting down the power to get more shots usually works very well. My impact in .177 can have 150 shots or 350 shots depending on the power setting. No regulator modifications needed.

Thoughts ? 

 
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riazp, thanks for the article that really gives a great overview. That said, I am guessing I need to decrease the hammer spring as much as possible for the new regulator set point. From what I am gathering the HST is hogging air. This will lower my FPE to a certain extent maybe too much but it should give me a good starting point. If needed I can re-adjust the regulator to see how it reacts. 

Thanks, 
Jay

 
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"jaydog"riazp, thanks for the article that really gives a great overview. That said, I am guessing I need to decrease the hammer spring as much as possible for the new regulator set point. From what I am gathering the HST is hogging air. This will lower my FPE to a certain extent maybe too much but it should give me a good starting point. If needed I can re-adjust the regulator to see how it reacts. 

Thanks, 
Jay


Click to expand...
What I would do is turn your hammer spring to max pre-load and see what you get at the present setting. If the FPS is not at least 20 over what you want then you need to increase the set point.

Let's say you are looking for 850fps. If you can't get like 870fps out of it with max hammer spring then you need to increase the pressure until you can. (at the max hammer spring setting) Once you are at the pressure where you can get 870fps then I would reduce the hammer spring until you are at 850 and you should be tuned pretty good for max shot count, and you will be at the fps you want. You will also be able to continue your shot string for a couple of shots "off the regulator" where the velocity will raise to 870 and then come down, keeping a similar POI.
 
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bigtin, i have a couple questions on my new regulator tune. Ok so went back to the drawing board on calibers and switched to a .22 350mm barrel. From others advice I heard the .22 cal is more efficient with air. 

I turned the hammer spring power all the way down to minimal power. Regulator is set about 95 bar. I started at 250 bar fill an ran started shooting a 13.4 grain pellet out at 760 fps.

250 Bar fill
Shots 1-10 were end psi 238 bar avg pellet speed 760

Shots 10 - 42 were 771 for some reason pellet speed jumped up 10 to 13 fps. Ending PSI 95 bar.

Shot 43 , 44 were 850 and 870.... off regulator I guess the pellet speed jumps up. 

During the test from shots 10 to 40 I dry fired the gun some just to speed up the process ? This might use more or less air for dry firing not sure ??

I am curious if I should lower the Regulator down to like 85 bar or 80 bar to get more usable shots ? Again the power is turned all the way down so not sure what I could do to increase shot count ?

Thanks 
Jay

 
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Jay,

Yes a .22 is able to be tuned for better efficiency due to the large diameter base (as compared to .177). If you are getting 42 shots at 770 with 13.4g pellets from 250bar down to 95 bar, your efficiency is 1.81fpe/cuin which is darn good at over 17fpe.

What you need to figure out is what you want from the gun. Then tune it for that. Are you looking for a certain number of shots? or a certain power level? Max power? Max shot count? Decide which you would rather have and then start from there. Depending on what you want will determine what you need to do.

And yes lowering the reg pressure will get you more shots, but at a lower FPE. If the power level you get at 85bar is acceptable then the answer to more "usable shots" is yes, if the power level is not acceptable then the answer is no.

In theory I think dry firing could use slightly less air as without any "back pressure" from pellet friction I think the exhaust valve can close slightly faster. Is it enough to be noticeable? I don't know without testing it both ways.

Now if you want 50 shots at 20fpe (out of a 41cc tube) then that ain't happening.

Note- Best I could find on the size of Leshiy air cylinder is 41cc. If the cylinder is different then the calculations will be off.
 
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BigTin, strange results when I lowered my airgun regulator to about 80 to 85 bar. My gun is also on the lowest power with the Spring tension. 

Ok first off from a 250 bar fill I might of had just a little more air in the last test because of my refilling air tank had more air. 
So wierd thing is lowering my regulator made the pellets speed up to 824 fps. 

So actually lowering my pressure got me more power but a few less shots or about the same amount ? Strange as heck.
So shot string as follows. 
shots 1-10 avg 820 where my last test with regulator at 95 bar was 760 ?
shots 11-20 avg 824 200 bar setting here
shots 21-30 avg about 822 about 145 bar here 
started about 80 to 90 bar shot 31-40 833, 830, 841, 844 837, 824 808, 795, 764 stopped ending a bout 80 bar

I am not complaining. I actually seem to like the power an shot string about 20 FPE but...... The shot count has gone down while power gone up which is opposite of what I thought would happen. There is a little line on the huma regulator that points to the Bar setting. 
So it should be simple unless I am not reading it correctly. 

Any input is always welcome. 

jay
 
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Sounds like you actually turned the reg up and not down. In the 820's for 30 shots and then raises to 844 and back to 824 over the next 6. So 30 shots w/i 1% and 6 more w/i 3%. This should give the same POI out to 50yds. If 20fpe is good for you then I've say it's tuned pretty efficient right now.

If you look at the tunes they are not much different as far as efficiency goes - 42 at 17fpe (714 total fpe) vs 36 at 20fpe (720 total fpe)
 
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BigTin is there any more efficiency gained in going to a .25 cal ? I might try switch barrels to a .25 just to see some of the output. 
I seem to find that the .22 cal on my research shows the most shot count out of the calibers of .177, .22 and .25 or .30. 

I might try one more setting but I think I am getting what I got. I thought there might be some magical setting that would drastially get me more shots at a lower fpe.

Anyway stay tuned, believe it or not you are helping me and much appreciated. 

Jay
 
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In the 20fpe range I don't think the .25 is any benefit at all. You may see a slight increase but for me it wouldn't be enough to have to put up with the loopy trajectory.

You can get more shots in the 12fpe range. You just lower the reg some more and then since the hammer spring is at minimum you would have to either put in a softer spring or cut some off the one you have.
 
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Big tin, I have played enough with the regulator and just come to the conclusion this airgun wants to shoot fast. 

I backed the regulator down to 70 bar and it shot fast and hard, like an average of 21 fpe for about 28 shots. 
I then raised the regulator pressure to 85 bar and it shot about 19 to 20 fpe at around 33 shots. 
so then I raised to regulator to 108 bar and it shot at 750 about 16 to 17 fpe at about 37 shots 

at that point I have given up and figured id settle for 33 shots at 20 fpe. Not a bad mix of shot count to power. 
The gun with the air suppy will only do so much. It does not scale all that great. if I raise the regulator that means it goes of reg all that much faster. 
I can raise the regulator to 110 or 120 and play with the spring but I figure that just get me to the same point where I am at now. 

anyway just to keep you informed it is what it is. Thanks for all your help. 

jay
 
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