old colonel,
You should be able to use 44 cal bullets(even jacketed) by resizing from .429" to .423"-.425"(whichever the barrel wants), in fact you may be able to use then unsized, if one will enter a fired(but not sized)case easily.I use .433" 43 Spanish bullets,sized to .425" in my .404 Jeffery(also a 10.75) with complete satisfaction. If I remember correctly,your case should be about .493" head diameter, which is smaller than 45-70(.500-.505),but a chamber must be larger than the cartridge. Sometimes,a chamber may be enough larger that larger cases can be used. If a chamber cast shows 45-70 cases can't be used "as is", sizing the head to a useable diameter is not especially difficult.When you make the chamber cast,post the dimensions.
Mike
