divingin
Gold $$ Contributor
Idk if it would be headspace, both the Lapua and Peterson were brand new out of the box so virgin brass. And my sizing die is set up to be about 15 thousandths off the lands.....
I've found factory brass to be pretty short (base to shoulder) out of the box. Enough so that I've gone to new process of jamming the bullet into the rifling on the first firing with new brass to try and get the length back without stretching the case.