FX IMPACT .22 MAXIMUM POWER TUINING 40 GRAIN SLUGS

Guys there are many video's on youtube using the 40 grain slugs with the fx impact M3 with really amaizing FPS's going up to 984 with a russian guy on youtube, did any of you guys tried to reach that speed with the 40 grain slugs ? what setup tuning they r doing , no one replies ? i couldent reach that speed 

Using fx impact m3 with HUMA HIGH FLOW DUAL AIR V2 , SLUG KIT , and a heavy superior linear barrel 700MM.



https://www.youtube.com/watch?v=9CC4G7ilj4Y&t=148s
 
I have a .25 ImpactPP 700mm, heavy modded including internals machining. You need $$$, knowledge, machines, spare parts, time and $$$ and pellets/slugs and $$$.

I was building my Impact for like a year, I can completely disassemble it to smallest parts and re-tune all in less then an hour.

41 grain 1050+ or 46 grain boat tail slugs @1000+ is not an issue today.