Crimping a bullet in place might be the last phase of the reloading process, but it certainly isn’t the least important. In a number of instances, it’s absolutely necessary; other times, it’s optional and, sometimes, it should be avoided altogether. Knowing which type of crimp to use is important … and knowing whether to use a crimp at all can be a complete game changer.
Basic reloading techniques dictate that a straight-walled cartridge requires a roll crimp—which curls the case mouth into the bullet—to keep the projectile from moving deeper into the case under recoil or, in the case of a revolver, moving out of the