Impact MK2 .22 600mm Barrel Maximum FPE

[Wajih]

Hi Guys,

Please share your maximum fpe you are generating with mk2 impact .22 in a 600mm barrel.

In addition to this, Also wanted to know what is the maximum fpe we can stretch with impact mk2 .22 in a 60mm barrel. I have installed 720 power plenum, external plenum, pin proble, huma dual port as well. I can easily shoot 23 grains at 990-1000 fps at 125 bars. However, when i try to shoot 30 grains and onwards its only spitting them at 840 fps at max.

 What am i missing?

 

[bamavet55]

You may need to adjust/increase your regulator pressure and add a heavier hammer.

My FX Impact mk2 .22 cal. produces 76 FPE with Zan 40gr slugs. This rifle was purchased as a .35 cal. I should note that my barrel is 700mm.

I could squeeze out a bit more power, however accuracy suffers if I do so.

Ex:https://www.huma-air.com/FX-Impact-Hammer-Weight-Tuning-Set

Good luck!

Addendum: Have you seen the following video by Ernest Rowe?:https://www.youtube.com/watch?v=XqB3u4fW2Y0

 

[Jayson]

Yeah your not missing anything, 7 grains is a poope ton more in 22 cal with the smaller surface area!