I bought a new 1894 Marlin a couple of months back and after slugging the bore discovered that it was .432", which isn't unusual at all. Not surprisingly I guess, Hornaday XTP 240 grain .430" bullets won't shoot accurately at all even at magnum velocities. Also, loading .434" cast lead bullets from a custom mold will result in cartridges that won't chamber, based on the .432" inside measurement of the fired cases after spring-back. Some suggested that using faster burning powders might cause both soft lead and jacketed bullets to bump up and result in decent accuracy, but I'm not gong to invest in a .432" custom bullet mold to find out. Ultimately I decided that it's simpler to just load up my Marlin Cowboy in .45 Colt to magnum velocities, which is accurate with .452" jacketed bullets in a .451"-.452" slugged bore, and use a custom 230 grain .454" bullet mold for slower shooting. So the .44 magnum will get sold and I will replace it with a .357 magnum 1894C model with the shorter and lighter barrel, which does have a properly sized bore, and will be more fun to shoot anyway. The easiest solution.