Pyrodex P - the P stands for Pistol, which is a bit of a no-brainer - loads around 20 - 30gr by volume are good. Use wads or CoW to bring the ball to the chamber mouth. Mine likes the 26gr spout. Generally, Pyrodex P loads are 10% LESS than the equivalent FFFg BP for equal oomph.

Triple 7 - the triple 7 stands for the flash-off temperature in F - needs 15% less than an equally-oomphish BP load.

Note that while Pyrodex P will stand a little compression, T7 does not not. Not that it matters much in such an over-engineered piece as the ROA, but the difference is easily discernible in the hand.

Regardless of what you may have heard, BOTH require cleanup ASAP after shooting - even better if can can make a start at the range.

There are other subs, but I don't think they are sold over here. In any case, they are crap.

Good luck.

tac