Impact M3 .22 800mm barrel owners, please share your gun setup, ammo specs and your best tune.

[tnx206]

Hi guys,
So my barrel is getting delivered tomorrow. I have the power slug kit installed, will be installing the Huma high flow port and probe when the barrel gets here. I have some NSA .218 31.5gr, Javalin .217 and .218 34gr to try out. Also ordered some H&N .217 .218 38gr and 40gr. Just wondering what’s working best for you guys. Please post your regs info also. Thank you much.

 

[GA_LeadHead]

I found an incredible tune for my 22 800mm tensioned barrel. My M3 has the power block, AirMarksman Backbone rail, and tungsten hammer installed. I'm also using the NSA pin probe.
Shooting NSA .2165 31.2 grain slugs, I'm getting 1030fps with an extreme spread of 9 fps and a standard deviation of 2.2 fps. Plugged the numbers in JBM ballistic coefficient calculator and i'm getting a b.c. of 0.119, Shooting like a laser beam!
I also tried the .218 31.2 grain and honestly I could not tell much of a difference. Both shot extremely well.
I've got a 300 bar 700cc bottle on mine and I can get two mags per fill.

1st Reg = 180-185ish
2nd Reg = 160
Macro = 12
Micro = 3.5
Valve is a 1/4 turn in from line 4. ***

*** I would recommend starting with the valve all the way open at one full turn and a half out from line 4 and slowly work your way in until you find the sweet spot for your gun. Everybody's C1 (hammerseat) is not set exactly the same, so the valve sweet spots are different from one gun to the next. At least that's what I've found.

Hope this helps.