The only load I've used in my 45-70 BFR were Marlin level loads with MR-223, an Accurate ball powder that's similar to 2230.
I used a Federal 215 and a 360 grain bullet; I'd have to find the box to get the charge but it's never hung or left much, if any unburnt powder.
It gets there "right now", from a handgun perspective.
