Is there a power floor, a la IDPA/IPSC? If not, my pet load is 3.5-3.7gr of Trail Boss behind a 158gr cast, either LRN or SWC. Creampuff load and very accurate. Shoots perfectly from my Mod. 67 and very well from my 28-2. No chrono, so don't have velocity, but "the book" (Hodgdon's manual) shows a max load of 4.2 at a hair over 800fps.

I expect I may try my hand shooting ESR/SSR in IDPA this summer.