So I'm picking up my 338 Lapua rifle tomorrow. Figured I'd try a lot of Lapua, Nosler, Norma and Hornady brass. Gonna load 10 rounds of each and document it here to see which lasts the longest. Might have already been done but I thought it might be interesting. Anyone already been through this exercise? Bullet will be the 300 gr Berger OTM. Gonna shoot 10 round groups of each. I am going to assume 40 rounds can be shot from a healthy 43 yr old shoulder in about an hour or so? This is my first big bore rifle so I really have no idea. Just want to see for myself which brass lasts the longest. The Lapua brass was out of stock so that first batch will be factory loads with 300 Scenars. Gotta pick up primers and powder. H1000 or Retumbo? Which primers do you all like?