Snowpeak REGULATOR FPS PROBLEM

[cjvprecision]

hello Dear
Hope your all good, i have a artemis p15 gun and i set regulator pressure at 130bar, hammer screw is fully tight but fps near 800. it should be 870 or 900 plus. can anyone please help what to do.???

 

[Florida_Man]

What caliber and weight pellet are you using?
I’m guessing you shot chrony strings while noting the pressures to get your reg pressure?

 

[cjvprecision]

iam using .22 (5.5) 18.13grain pellets

 

[Keyman62421]

Mine is a 25 caliber. I can get about 706 out of a 25.3 pellet. And it's extremely accurate out to about 65-70 yards

 

[JimD]

It sounds like you have the hammer spring adjuster at maximum. That should be too much for a 130 bar regulator pressure. I think velocity should go up as you come down on the hammer spring. My P35-25 hammer spring would not work right at around 150 bar. The hammer would not release the air at higher pressure. I have not adjusted my P35-22 but it's setting from the factory is about 135- similar - and the hammer spring is not nearly max.

I would go down on hammer spring in either 1/2 turn or 1/4 turn increments noting the velocity until you see the velocity increase. Once it then starts to go back down you need to be shooting at least 3 shot groups and note the size. You want to be a bit below the maximum - the normal recommendation is 5% but I usually get better accuracy a bit above that. I just tuned a Bullshark in 22 that has a regulator set about 145 and it shot better at 2-3% below the maximum velocity. It also shot 18s well over 900 fps which I think is too fast. Fortunately it seems to like H&N Baracudas which are 21 grains. It is now tuned to shoot them about 850-860 fps which is about 3% below the maximum. Seems to be very efficient with this tune. Efficiency is the goal of setting the hammer spring less than the point of maximum velocity.