The 32 short and long Colt cartridges were centerfire adaptations of the old 32 short and long rimfires. The earliest versions used a "heeled" type bullet with external lubrication grooves. In fact, some of the single shot breech loading rifles could shoot either the rimfires or the center fires just by changing the firing pin. The same applies to some of the early Marlin lever action rifles in 32 caliber. A bit later, Smith and Wesson brought out the 32 S&W short and long cartridges using a slightly larger diameter case and bullet. Since Colt did not want to put the S&W name on their revolvers, Colt came out with the 32 Colt Police cartridge. It was the same diameter as the S&W cartridge but used a flat nose bullet instead of a round nose bullet like the Smith. From the end of the Civil War thru about 1930 the cartridge design and naming conventions could be really confusing!