Huge chamber?, ie, oversize? Dont resize the cases (might have to 'index' them too) and use as large a dia. cast bullet as will comfortably fit into the fully fire-formed case mouth. A smidge of crimp will hold all together for field use.
Repeat as needed
That would work better for me if I didn't have 6 other 45 Colt firearms. Thought about rechamber to 450 Bushmaster, base is .500" taper to .480" Still just a thought. DP
Handi's:22Shot, 22LR, 2-22Mag, 22Hornet, 5-223, 2-357Max, 44 mag, 2-45LC, 7-30 Waters, 7mm-08, 280, 25-06, 30-30, 30-30AI, 444Marlin, 45-70, AND 2-38-55s, 158 Topper 22 Hornet/20ga. combo; Levers-Marlins:Two 357's, 44 mag, 4-30-30s, RC-Glenfields 36G-30A & XLR, 3-35 Rem, M-375, 2-444P's, 444SS, 308 MX, 338Marlin MXLR, 38-55 CB, 45-70 GS, XS7 22-250 and 7mm08; BLR's:7mm08, 358Win; Rossi: 3-357mag, 44mag, 2-454 Casull; Winchesters: 7-30 Waters, 45Colt Trapper; Bolt actions, too many; 22's, way too many. Who says it's an addiction?