375 Ruger Brass

[FEENIX]

Forming 375 Ruger brass from 300 PRC would require a bit of work. You'd need to neck it up in a few steps, anneal at least once, and then fireform by either making a false shoulder to headspace or jamming a bullet.

Nonetheless, it is an alternative process, and it's what wildcatters did before 300 PRC brass were made available. I did this with .30 Gibbs. Below is using .35 Whelen brass to achieve .30 Gibbs.

(From L-R: .35 Whelen virgin brass, after re-sizing, fire-formed with 11g WSF (COW method), and after re-sizing). I have also experimented with .30-06, .270 Win, and .280 Rem brass to get the same result.