What I have noticed with observing a few different people's results. Bertram brass fluctuates on case weights but oddly has pretty close numbers on case capacity once fire formed. Guys have tested 28N, 300 NM, 6.5 SAUM and have saw 1gr spread measured internally cap with water/alcohol testing. Even though there was a 6gr spread in empty case weight. Their brass is tough, needs a full prep for neck thickness, primer/flashole, chamfer inside/outside of necks. Pretty much the same routine that should be done with all brass. I think you'll be presently surprised. I prefer ADG because they have more consistent case weights & neck thickness, but Bertram can be just as good with some prep.