I've tried Unique in .38 S&W, but have found the small amounts used (3.1 grains) makes it hard to meter through my powder measure, so I figured I would try Trail Boss as it is bulkier. Anyone try Trail Boss in .38 S&W?

I'll be loading 158 grain cast lead bullets, shooting them in my Victory Models and a Colt Police Positive, looking for a mild load around 600-700 FPS, something soft shooting for letting a 13 year old have fun with some old revolvers.