I had Mr. Ackley, himself, do a rebore to .35/348 Win Ack Imp... Feeds o.k. I have loaded to standard commercial manual loads, STARTING LOADS, for .358 Norma Magnum without unacceptable or even interesting signs of pressure. (YOU work at YOUR OWN RISK!!!) Got my rifle before ammo was available and no FFL was needed... Then, RCBS came out with form dies that would take the .45/70 case, I think, to either 8mm x 50mm R Siam or 8mm x 52mm R Siam ... Never heard much about the smaller rims of .303 or .30/40... With P14s out there, why? This rimmed brass is not strong, as much brass as a modern magnum "head." Beware... .38/56 (on .45/70 rim)WCF Ackley Improved is an interesting all around gun for big game. The .348 was built on the same rim as the .50/110 buffalo gun rounds so I would think you could do the shorter ".50s" Sharps, Ballard, etc. As long as you don't want endless case life and don't over work the gun... Not a Mark V.... ENJOY... luck, happy trails.