Buckshot has loaded some 148 wadcutters in 38 S&W, he has a wide-cavity #359063 mould IIRC. My boolit for the Colt PP is the Lyman 150 grain SWC (#358477), which works because the little Colt has tighter throats and grooves that accomodate the castings' dimensions. These I run to 725 FPS atop 3.3 grains of Herco or 3.0 grains of Unique. The loads shoot right to the sights at 25 and 50 yards.