If you can get your hands on some of the 330gr Gould pattern cast hollow-points for .45-70, or a mould & make your own (Lyman still sells the mould) I've heard of guys loading it in .45-60 for a876 actions. It's a bit too long, but apparently a little shortening of the brass solves the problem. There's info available in the form of a few articles here & there.
That'd make a sweet deer combo.