I almost gave up on my ARC due to lack of temp stable powders.Thx for update. I ve yet to try in 6 CM but I ve shot about a dozen in my 6 ARC with 4 different seating depths and all same powder charge so far. Nothing has jumped out as really good… mostly 1”+ but the bullet is giving me 3000 fps in my 22” mini with 29.5 grs of TAC. That same powder charge does 2950 fps with my 80 Sierra Blitz but at 5/8-3/4” moa.
Going to play some more and try some different charges at some point too. On oal I ve ran 2.355” (jam) to 2.26” so far. Next is 2.240” and maybe shorter ….