If you want to run heavier bullets, the 44 Marlin has the 1 in 38" twist that may not be as accurate, or it may shoot fine, some do some don't. The 45 colt has a faster twist, both will handle Ruger/TC loads easy. 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?