If you want a load that will not have hard recoil but will put the knockdown targets down and defeat the Texas Stars try the following:
158 or 140 grain bullet, 1.0cc of 2f (I have used Goex, Scheutzen & Diamondback) and a goodly roll crimp. This load works great out of my pistols and 1873 repro rifle. 3f works fine too.
I have never met a target it could not handle if I did my part.
You may find 1-1/2 or larger grain BP to simply be to large of grain to do well in the 38spl brass.
PR