I don't remember hearing a logical explanation, but it seems like the old .45 is often plagued with arms with over sized chambers, cylinder throats that are too small, bore diameters that vary, etc.

I haven't found this with the 94 Marlin, but every 94 Winchester in 45 I have owned has had a sloppy chamber. As you read these articles, make sure the 94 they are referring to is the Marlin.

"The greatest danger to American freedom is a government that ignores the Constitution."
Thomas Jefferson