22 Grendel, slightly bigger brother to the 22 ARC
I built this in late 2022 with a Howa mini & factory 223 1-8 19" barrel, been sitting in the safe for a couple of years since then, I had an AR upper in 22 Grendel back in the good old days
https://hosting.photobucket.com/c75a...720&fit=bounds
It's had 147 rounds through it now, started with the 77 TMK & it shot incredibly well at around 3050 fps with 2208
https://hosting.photobucket.com/c75a...720&fit=bounds
With the recent advent of the slightly smaller 22 ARC and load data availible, I dug it out & loaded up some 68 HP, 77 TMK 80 & 88 ELDM for fun with a ball powder
https://hosting.photobucket.com/c75a...720&fit=bounds
It still shoots very well for a factory barrel even with the noticeable increase in velocity from the different powder, with the 77TMK, & 80, 88ELDM easily capable of sub 1/2 moa at 100