I found a load for the 45-70 that works REALLY well in my Marlin 1895. 43 grains of AA2230 with a 405 grain jacketed soft point. Just shy of 1800 fps. Shoots about 2.3 inches at 100 yards. Bit of a thumper, but very accurate.
Just thought I'd post this as powders for the 45-70 are still somewhat hard to find and AA2230 seems to be available. It's not a go-to powder when I think of the round, but this load shoots very well for me.