AirgunAdvice.net

[blk822]

I have a bsa pcp and it's supposed to get 30 shots per fill @232 bar, it's unregulated. The first 10 shots are quiet with just alittle humm after each shot. The next 10 shots get louder and then the next just alittle louder. After 20 shots I can pump it back up pretty quick, but if I take 30 shots on the fill it takes alot of pumping. Like the last 10 shots take alot more air than the first 20 shots.And you don't notice the hum sound after each shot as much as the first 10. I don't know if I should just take 20 shots and fill or if theres a problem with the rifle, POI dosn't seem to change at 30yrds over the 30 shots, but I havn't been able to really put it through the tests I want due to rain and beening dark when I get home from work. I have heard that the hammer may be bouncing on the valve when the air gets lower and releasing more air than needed. Does any one tune BSA PCPs ? Or is this just a normal thing and deal with it? O' and if you need to know it's a .22cal unregulated multi shot Hornet called a sportsman HV, only sold at sportsmans wharehouse.
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Gun Control is hitting what you aim at...

[220swift]

If you could run it through a Chronograph you can get a fps set of number's to see where the hot spot on your gun is and determine the best fill psi ,a lot of gun;s have a arc to the power curve which might be the sound that your geting. quite then louder then quite again.


swift
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Swift
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