Re: 338 Edge Bertram Brass Shoulder inconsistancies. Fireform First?
When I tested it ages ago against the Fed, RP, Nosler & Norma brass, I found the Bertram brass I had was long in the shoulder & I had to remove some metal from the bottom of my body die to push the shoulder back enough, it was quite hard & would spring back otherwise.
The necks were thinner & the head was bigger which meant it expanded less & held onto the primers even in obviously ovderloaded cases.
The Remington cases were happy with the same load & gave more speed.
The Nosler/Norma cases gave the best speed for powder charge but were overloaded, so the RP could take more powder & catch up in the velocity stakes.
FWIW, in the end I decided that the RP brass was the best overall brass for myself & clients to use, taking into consideration, ease of use, cost, velocity achieved balanced with longevity.