I have been casting for .45-70 for fifty years. My favourite target load is Lyman 457193 at 405grs sized .459 and 20.0grs (twenty grains) IMR SR 4759, this shoots into 2"/ 100yds from my 1886 Winchester with iron sights. This has low recoil and is very pleasant to shoot all day. I do not use a filler or gas check.
An excellent hunting load is the same bullet with 55grs (fifty-five) IMR 4831 and is a compressed load. This is low pressure and leaves lots of unburned powder in the barrel, however it is almost as accurate as my target load and quite powerful, unsure of velocity but guess it to be about 1500 fps.