Bullet swaging is the process of making the bullet or inert metal portion of the cartridge (which becomes the projectile when fired) by using pressure to flow the materials at room temperature. Unlike casting, no heat or molten metal is used.

Used to hold grease lubricant, as a crimping ring for the case neck, for identification, to help the jacket hold the core from shifting forward on impact, and as a guide in seating the bullet to the right depth in the case neck.

The kits produce high quality copper gas checks using .030-thick 1-inch wide strip (available from Corbin in 5-lb bundles Cat.No. CU-5, and in 100-pound coils Cat.No. CU-100).