A full length sizing die is designed to resize the entire cartridge case, unlike neck-sizing dies that only resize the neck portion. This makes full length sizing dies versatile and compatible with any rifle chambered for the same cartridge. When a cartridge is fired, the brass case expands to fit the rifle's chamber and although it contracts slightly afterward, it may not return to its original size. The full length sizing die addresses this issue by resizing both the neck and body of the case, effectively removing any bulges or irregularities that occur during firing.

.300 AAC Blackout steel full-length sizing die assembly

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