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My book doesn't list the specific calibres for the low wall rifle but it does for the low wall carbine and 44-40 is the largest. My 'guess' is that it also applies to rifles.
I have one in the old 25-20 single shot calibre so thats not a handgun cal. It has been re-chambered to 25-20wcf.
One of my books says 'a variety of low powered rounds'!