This form will help you set the proper crimp for your semi-automatic pistol cartridge. These settings are only for taper crimped cartridges used in pistols. These settings do not apply to roll crimped cartridges such as those used in a revolver. For best results you must use a dial or digital caliper to measure your bullets and brass. NOTE: All measurements are in thousandths (.000) - you will need calipers to use the calculator.