I shoot some Pat Garret here in Aust and am lucky to still have an unopened Trail Boss (1.5kg or 3.3lb) and a 1/4 of an opened tub, so that's still my slow fun 45/70 load.

I also still have a year or so of 2205 left but yes, I am not holding my breath.

I found a few boxes of 500gr round noses so am going to try 28, 30 and 32gr of 2207 (same as H4198) and see how that goes. I got those loads from the Hogdon part of the 45/70 One Book, One Caliber (it was for 485gr proj but they are trapdoor loads so will be safe in the DR).

Might be a while before I can test it as the local range is closed for repairs (road works that are long due).