The case was made too short. It should have been extended to 6.8 SPC length. 85gr Partitions at 3100fps, 90gr Accubonds at 3025fps from an 18" AR-15.
Left to right - 6PPC, 6mm Too Short ARC, 6mm Correct Length ARC, 6.5 Grendel, 6.8 SPC.
Tony
I agree with this for medium weight (90 and 95 grain) bullets, which is what I use. It would be perfect. Just a shame making that case out of .220 Swift brass is a PITA.