I don't have a listing on the .460 S&W, but the Casull's SAAMI pressure rating is 57,000PSI.

The .410 ctg. I just measured, a 3" Rem. Peters was .473" on the brass. That is why the .444 Marlin case fits, at a nomimal .469".

The chambers on both of my daughter's BOITO shotguns measure .475" with .410" bores, exactly.

The .454 Casull case, at a nominally listed .4775" diameter should not fit in my girl's shotguns, which is just fine.