This type of crimping die is typically used on cartridges that headspace using the case mouth, common calibres such as 9mm, .40 S&W or .45ACP. A slight inward taper is applied to the case mouth, pressing it against the bullet to improve feeding and alignment.
Creating a smooth, even transition between the case and bullet, enhancing reliability and accuracy in self-loading firearms.
The Lee Taper Crimp Die is hardened steel designed to overcome crimp problems caused by poor die design. These dies offer little or no advantage when used with 1986 or newer Lee Dies as the crimp angle is already a modified taper crimp. Jacketed bullets must have a crimp groove.