40-65: Learning what I can

[Kurt]

Sometimes I think folks can think these things to death.
The Browning chamber is a proven winner. So is the Shiloh. 40-65 Rl is another good chamber, but the difference between it and the Browning are very slight.
Starline cases work fine, in all 3 of those chambers, sizing down 45-70 cases is how Ron Long came up with his 40-65 RL case, it's actually a tad longer than a typical 40-65 chamber.
16 twist will handle anything needing done with the 40-65 case and blackpowder. 14 twist best left to longer cases, and smokeless.
So long as those RCBS dies will expand the case mouth back to the proper diameter as to not put to much neck tension on the bullets they'll work just fine.

But man Don that Browning chamber has a .100" cylinder freebore. I'm not sure I Would want that much unless I shot greasers or a patched tight long ogive bullet.

Kurt