Oh gosh iam having a 338 edge built and its nearing the final stages . My gunsmith said that I should send him a dummy round. I haven't got my dies yet and don't know about what to do. I can order dies on Tuesday that might work. What coal should I load this round to. Iam am planing on just shooting 300 smk and bergers. Oh yea my magazine is a seekins and I think the inside length in 4 inches. Any help with this would be great . Thanks in advance too.