I just put a 158 gr Midway LSWC through my Colt Official Police 4 inch with 6.0 grains of Power Pistol behind it (maximum Speer load). As hot a .38 Special load as I've shot so far. Put it in the cylinder with another round with 5.2 grains of Unique (maximum Speer load) and a round of 4.0 grains of Unique. Needless to say the 4.0 Unique was pretty tame, but 5.2 Unique was pretty vicious....but the Power Pistol 6.0 was slightly tougher and felt pretty impressive....that is until I dropped a Remington LHP +P into the gun and fired it....if both the Power Pistol 6.0 and the Remington had been in the gun at the same time....I'd swear they were they same. It was after sundown so I couldn't use my chronograph. I don't know which one was faster (if any) but I plan on taking the chronograph out with another load to see