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I'm going to second the reccomendation of Trail Boss.
When I still had a .45-70 one of my favorite loads was a 405 grn cast bullet at about 700-750 fps. This gave enought velocity to stabilize the bullet, but still was fairly quiet. You would still want ear plugs for extended range sessions, but for an occasional shot at a rabbit or armadillo, it didn't make much more racket than a .22
Since I've sold the gun, I can't remember the load, but I do know that it was published, so you shouldn't have much trouble finding one.
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