One-hand slow fire from 25 yards. My colt army gets higher velocity with the same charge though the extreme spreads are about the same from several revolvers. This is not an unusual level of accuracy
Same thing, a 36 caliber 61 navy with chambers filled from a 28 grain measure though I don't remember whether it was black powder or pyrodex. This is an unusually good five shot spread with me doing the shooting.
I don't do much bench rest testing because I don't much care what the absolute accuracy is as long as they will shoot off-hand like the first picture..or even a bit larger group. I have gotten very good accuracy with near-rammer-bending loads of over 35 grains in the .44s though I see little use for loading that heavy. Ive also gotten fine results with 55 and 60 grains-volume equivalent of goex, swiss or pyrodex p in walkers.
all of the above using either commercial or cast round balls