Swiftshot, can’t really help you on the quality of Bertram brass. I’ve only reloaded a few 284 Win with Bertram cases. Email Beaks and Brass, they’ll answer your questions. I met the owner when I was looking for 284 Win cases and we chatted about shooting and about Savage 99s. I don’t think he’d steer you in the wrong direction for a quick sale.
Nick