Impact .22 W/ Power Plenum tuning

[bzizzi373]

I set up one of my Impacts to .22 cal with FX power Plenum and 500mm slug liner, I modified transfer port and probe as well, gun currently shoots .22 FX Hybrid slugs accurately at 950 FPS. shoots the redesign JSB 25.39 @ 920 accurately but the big surprise is how well gun shoots 18.1 gr JSB's at 1025 FPS. Shoots them accurately out past 100 yards, As soon as you pull the trigger pellet is there ! Ended up filling up some magazines with the 18.1's and will take Impact for a long walk. Regulator is @ 140 BAR, power wheel set to #3

Valve adjuster set to line 3.

 

[Jlands]

......... Regulator is @ 140 BAR, power wheel set to #3

Valve adjuster set to line 3.

Just curious, is this the settings you shoot the hybrids at? I hope to get that speed with less reg.

Thanks

 

[bzizzi373]

Yes, 950 with 500 FX slug liner, use 600 liner and get same with lower reg pressure.

 

[Jlands]

Yes, 950 with 500 FX slug liner, use 600 liner and get same with lower reg pressure.

Thanks for replying. I am waiting on a 700mm slug liner and hybrids to arrive. I should be golden. I'm going to start at about 110 and work my way up. Want to be at about your speed give or take.



Thanks

 

[Tkristbaum]

I get the same numbers at 120 bar reg pressure

 

[Mrshosted]

I get the same numbers at 120 bar reg pressure

Me to with 700mm at 120 bar Im pushing the JSB 25gr at 965fps and the 24gr Nelson slugs at 970fps

 

[slo642]

My 22 MKII PP is at 110 bar max hammer or 1 down the adjustment screw is not maxed out hammer stop is between 2 and 3.

the fx hybrid is at 1005 slight adjustment down keep the jsb 18 at 970