so, quick update. I now have a 6mm arc build completed on a 20in ballistic advantage barrel.
Brass is an issue as expected. I bought 100rnds of Hornady factory ammo to get me started. Supposedly Peterson was supposed to start making it early this year, but so far it does no appear on their website. I will probably wind up putting some starline 6.5 grendel brass on backorder and forming my own. 100pcs is not enough for what I want to do with it. and I am not going to keep paying for factory ammo to get the brass.
Shot 90 of that yesterday. Had some accuracy issues that I am chalking up to my muzzle device coming loose.
But I did get some rounds over the chrono. the Hornady match box stated they used a 24in barrel. The black did not list a barrel length, however it was only 3g difference in bullet weight and the listed velocity was identical, Id say its probably the same length.
Hornady Match 108g eldm listed 2750fps
Chrono at 15ft
81F
18 rounds recorded
Avg 2570 fps
ES 83
SD22
Hornady Black 105g OTM listed 2750fps
Chrono at 15ft
81F
20 rounds recorded
Avg 2613 fps
ES 39
SD12
Jetinteriorguy
May be having some issues with the brass goat. not 100% sure yet. I noticed after firing the case mouths appeared to be slightly smashed or flattened on one side. nothing crazy but noticible. I took the brass goat off and chased a few down and they looked normal. Also ejection was right at 3:30 with the brass goat off. However i had a fair bit of brass on the shell deflector, making me think the brass goat was causing the casings to bang against it while being ejected. still need to test that theory a bit more.