Must be an 1894C. The 1895 is only in .45-70 and .450 Marlin, and .444 Marlin. In any event, both feature Ballard rifling which was developed shooting lead bullets, so, yes, they are just fine. The 1895 45/70 prefers cast bullets sized about 0.002" over groove diameter. I don't know if that will apply to the 1894C? You may discover firelapping helps keep lead bullets shooting a bit more cleanly in your gun. Gas checked bullets will make it more tolerant of load variety.
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