Donny has been busy shooting, reloading and experimenting with 6 arc and has written up a break down of his experiences with the idea of helping fellow bowlers on their quest for the 1000 yard AR15 gas gun:
Do you crimp? I have movement with 105 hybrids using a .240 mandrel (7ish thousandths). I just picked up a .238 mandrel to try and avoid crimping.
Do you crimp? I have movement with 105 hybrids using a .240 mandrel (7ish thousandths). I just picked up a .238 mandrel to try and avoid crimping.