FX impact high power mods

[GQ]

This is what i have without modification wirh JSB 44.75 grains from my .30 cal Impact.

 

[tutuan]

Mine with JSB 50.15 grains can get average 815fps. But on the FX website, they said the Impact can deliver up to 82 ft/lbs which means mine has to push that 50.15 grains at 860fps. Working on that.