12.5" Pistol

[CrisAnderson27]

I chronographed Wolf 100 grain FMJ out of my 16" 6.5 Grendel with a Magneto Speed chronograph average speed was 2507 FPS. The shorter you go down from 16" generally the more loss in FPS compared to going to longer length barrels.

Just for comparison here are some averages of other factory loads out of my 16" barrel.

PPU 110 grain FMJ avg 2510 FPS

PPU 120 grain BTHP avg 2392 FPS

Hornady 123 Grain A-Max avg 2419 FPS

Hornady 123 grain SST avg 2430 FPS

Wolf 100 grain FMJ avg 2507 FPS, Max 2528 FPS, Min 2486 FPS extreme spread 42 FPS.

The Wolf 100 grain FMJ chronograph average out of an 18" Brownell's barrel was 2571 FPS. Your velocity out of a 12.5" barrel seem pretty good seeing how my 16" only produced 2507 FPS.

That makes me curious what my 20" gun will do. I'm building a 10.5" 5.56 next week...so when I take it out to sight it in I'll see about bringing a box of 123g SST, and the Wolf 100g to see what they both do out of the short and long gun.

On the speeds for the 12.5"...it does look like it's doing better than it should be, rather than worse. Black Hole Weaponry told me that it likely would. They use a 3r rifling that supposedly improves accuracy and velocity both.