For small game in 32 and 36, I'm using 20-25 grains of 3f (or Pyrodex P). In both my 50 and 54 I use 30 grains. All are minute-of-rabbit-head well beyond 25 yards with those loads.
I've never tried heavier loads in the 32 and 36, except during early sight-in and accuracy testing. My goal was low velocity, and though I started at 30 or 35 grains in each (3f/Pyro P), I kept cutting the powder charge until I no longer got the "crack" of supersonic bullet flight. Coincidentally accuracy jumped at that point, so I quit testing, carved a powder measure and went hunting. The same process was used with the 50 and 54's, except for those I went on in search of faster loads for other uses.
Both the 50 and 54 really like 50 grains of 3f/Pyro P for target, general purpose plinking loads. For deer hunting my 50 settled in at 80 grains of 3f/Pyro P. The 54 likes 90 grains of the same.
I've worked up loads with 2f/Pyro RS for the 50 and the 54, though both powders are noticably dirtier shooting than the 3f/Pyro P. The 50 likes 90 grains and the 54 likes 100 grains.
Coincidentally (or not!) all guns hit more or less the same point of aim with all their charges out to 50 yards or so. It's only beyond that range that things change. The heavier loads in the 50 and 54 are way low at 100 with the 50 grain charge, and I haven't even tried the 30 grain charge out there. With their heavy charges each hits about 4" low at 100. Plenty good for deer hunting out that far, though I prefer to hold my shots to 75 yards and 50 or less is my usual deer range.
