A device employed in ammunition reloading processes applies controlled heat to the necks and shoulders of spent cartridge cases. This process softens the brass, making it more pliable and reducing the risk of cracking or splitting during subsequent reloading steps. For example, a reloader might use such a device after resizing bottlenecked rifle cartridges to prevent case mouth splits and ensure consistent neck tension.
This controlled heating and cooling process improves the consistency of the cartridge case, leading to more uniform bullet release, increased accuracy, and prolonged case life. Historically, reloaders have used various methods to achieve this, ranging from hand-held torches to rudimentary temperature-controlled ovens. The development of dedicated machines offers a more precise and repeatable process, contributing to the increased popularity and safety of ammunition reloading.
