Thread: Brass deformation - rimmed (303) vs shoulder (308)

Guys,

Can anyone pls shed some light on the differences between how brass deforms and "grows" during firing when comparing a case like 308 that headspaces on the shoulder vs a rimmed case like 303 British.

My normal reloading routine for "shoulder" brass is to bump the shoulder 2 thou back, and then use a collet neck die, as I want to work the neck the least amount possible.

Looking at reloading 303, but not sure if the same logic would apply, or if there are specific considerations for tapered, rimmed cases like the 303.

Ta, ebf