I've got a problem: I've decided to coax my No. 4 rifle (a 2-groove Savage) to shoot Montana Bullets' 190 grain spire point bullet, sized .315.
Yeah, I know, it's probably never gonna happen. But I'm stubborn... and like an idiot, I bought Lyman's M die for the .303, only to learn the expander plug mics .309. I'd like a plug that mics .313 or thereabouts (if a little larger I can patch).
.313 inch is 7.95 mm. I wonder if Lyman's M die for the 8x57 is worth a try? Or is there a machinist somewhere who could turn out a custom expander plug?
Or would .313 be too small? Maybe as much as .315... brass spring-back would be, what?