Wow, how data has changed! I'm looking at a Lyman 41st edition and it shows 5.0 grains of Unique as a max load for the 148 gr HBWC, the 358156 and the 356429. In its ".38 Spec. High Vel." section, it goes up to 7.7 grains for the HBWC (1285 fps) and 6.4 grains for the 358156 (1154 fps). it does say "heavy frame guns only".