Lyman's #49 shows 5.0 gr of Unique or 4.5 gr of Winchester/HP38 to be close to but under max and both have worked well in my .38's using standard .38 Special brass. Guns: S&W models 36, 637, 60 and 19. Accuracy varies from 3" @ 25 yds with the shorter bbls, to <2" with the 6" M19. I cast my own with Lyman's 358156 and use them w/o gc, cast from wheel weights and lubed with 50/50 alox/beeswax. HTH's Rod