Here's a couple of squib loads that do a fine job for popping tin cans or close up target practice and the like:
1. .32 S&W Short, use 1.0 to 1.2g of HP38 and a 98 to 100g cast bullet, sized 0.313".
2. .38 S&W, use 1.5 to 2.0g of HP38 under a 155g SWC cast bullet, sized 0.360".
EDITED 6/7/12:
.32 S&W Short:
Try 2.8g of AL-8 under a 98g cast bullet that should be mild enough for any of the 32's. (AL-8 is a very old powder that I got a heck of a buy on about 30 years ago, and STILL haven't used it all up. It's about like Blue dot, which in turn is similar to H110.) I deliberately chose such a slow powder because I don't want to strain these lod junkers, and don't mind some unburnt powder. If you don't happen to have AL8, try the other two powders I listed. Enough power to stop enraged charging pop cans, but not enough to strain the old breaktops. Wouldn't want to get hit with it though!
38 S&W:
Try 2.3g Bullseye under a 150g SWC. This seems pretty close to factory ammo, judging by the feel and lack of apparent pressures. The breaktops seem to tolerate it well enough, and it's the smallest charge my RCBS Lil' Dandy powder measure will throw. Definately don't want to get hit with this one.
7.65x54R:
Try 30.0g IMR 3030 under almost any heavy cast bullet of 150g to 210g that fits the bore. Makes a real nice target loads with little recoil and enough power for deer hunting if you lean that way. Will keep most of its shots touching at 25 yards, and that's with iron sights and old eyes.
Anyone got a 38 S&W load with Trailboss and a 155g bullet that is low enough in pressure for use with a breaktop revolver?