Videos tagged with Case Mouth

This guide explains the necessity and methods of crimping ammunition. The primary function of a crimp is to prevent bullet movement due to recoil or cycling, crucial for tubular magazines and all handgun cartridges to avoid dangerous pressure increases. While often unnecessary for standard rifle cartridges, specific situations like lever-action firearms or high-recoil handguns demand it. Proper crimping involves targeting the bullet's groove and avoiding over-working the brass to maintain case integrity and accuracy.

This guide details the operation of the Frankford Arsenal Universal Precision Case Trimmer, a drill-powered tool for resizing cartridge cases. It covers selecting the correct collets and shoulder bushings for various calibers, adjusting the trimmer for precise case length, and the trimming process itself. The video emphasizes the importance of resizing cases before trimming and highlights potential challenges with cartridges like 300 Blackout due to their minimal shoulders. It also touches on optional upgrades like carbide cutters and pilots.

This video provides a foundational understanding of cartridge terminology, explaining key components like the projectile's boat tail, flat base, and ogive, and how to measure them for reloading consistency. It details the elements of a loaded cartridge (projectile, case, primer, powder) and differentiates between various case types including rimmed, non-rimmed, bottlenecked, rimless, recessed rim, and belted magnum cartridges, explaining their headspace mechanisms and design purposes. The instructor emphasizes the importance of understanding these terms for shooters and reloaders.

This video demonstrates how to set up and use the Lee Factory Crimp Die for 300 Blackout ammunition. The instructor details a method for establishing repeatable crimp settings by marking the die and press, allowing for light, medium, and heavy crimps. Testing reveals that while extreme crimps can distort bullets, a medium to heavy crimp is generally effective for preventing bullet setback without significantly degrading accuracy or brass longevity.