Nice thing about the 71/84, is the .446" groove diameter, compared to my 1876 version, with the .457" groove.

A .43 Mauser chamber will not normally allow larger than a .446" bullet to be seated in a case.

That is why I re-chambered mine to .450 Alaskan, just so I could shoot it. Mind you, a paper patched very soft bullet might have expanded enough with black powder, to shoot decently, or not as they were originally designed.

I am assuming not sufficient enough in the accuracy department as a reason they went with the tighter groove diameter of .446". Both versions have a .437" to .438" bore diameter.