Description

The Redding 81153 is an essential tool for the .300 Win Mag reloader, particularly because of the cartridge’s unique belted case design. While factory ammo headspaces on the belt, fire-formed brass headspaces on the shoulder. By using this Neck Sizing Die, you allow the case to fit your chamber perfectly, which eliminates the “slop” associated with the belt and typically results in tighter groups and better consistency at long range.

Because the .300 Win Mag is a high-pressure round, full-length sizing often leads to premature brass failure (case head separation) just above the belt. Neck sizing significantly reduces the “working” of the brass, allowing you to get more reloads out of expensive magnum cases. The die features a hardened steel expander button and a decapping rod assembly.