09-19-2022, 09:58 PM
Dino may be right about annealing to help fix it but this is not the first or even second post I have seen concerning Lapua brass and the 6 ARC. Johnnys reloading did a spot on YouTube on the same issue with Starline and later Lapua I believe.I have only ever used Hornady brass. Once fired arc and Grendel brass and haven’t experienced this issue. Once fired Grendel brass I size the neck and push the shoulders about .003-.005”. Then size a second time to push the shoulder the rest of the way. Trimming to length in between sizing. Some may disagree with that method but I’ve have zero case lose due to sizing and no issues like the OP reports but that’s the way I’ve done mine since day one. If ain’t broke. Annealing could fix your issue but you won’t know til you try it. I would like to know myself what’s causes it.