FX Impact MkII 720PP power block max power numbers

[TwoLoe88]

So I'm new to AGN but I've actually been in the fire burner and air game for about 12 years. I have been tuning and modding since 2017 and want to throw some numbers out and see how I compare to others. I am current running a FX Impact MKII with the new Power Block. I've milled out the power block and transfer port, rebuilt the regulator with brass piston, 13 Belleville washers (210 bar on the reg), 18.3g tungsten hammer weight custom made from a local fab shop, 50.5mm hammer spring(stock spring cut down) no hammer adjustment screw. I am shooting 62-grain varmint knockers .30 caliber going 1120FPS giving me roughly 178 FPE.. I have a 700mm barrel and get 3/8 inch group at 50 yards in no wind. Is it even possible to squeeze more from this application?

 

[2L8]

TwoLoe88.
This will be an interesting post to follow I will say.
These questions of power possibilities have been going on in the airgun world since the break barrels days. Your modifications and tuning for an Impact are very interesting. I hope to learn from you and the responses as I have both the mk2 and M3 in all calibers.

Patrick

 

[bigHUN]

OP.
I have machined my power mods as well and stepped over the limits I cannot go back and fort to pellets without taking my .25 x 700 MK2 apart again.
I have heavier 44 and 46 gr slugs but for now those just waiting for next available time.
Currently shooting the ZAN 41 gr 1060 fps with Reg at 137 bars. The average group size is about 1.5 MOA at 100 meters, I am shooting rings and not dots.
I am not happy with this 1.5" group size, onse I spend all the slugs I will re-tune back to pellets. Up to 100 meters pellets more accurate.
And btw with pellets, the speed is an enemy.