RCBS .280" Steel Neck Sizing Bushing

A .280 inch steel neck sizing bushing for bushing style neck dies, made by RCBS. The bushing sets the finished outside diameter of a sized case neck, and that diameter in turn sets how hard the neck grips a seated bullet.

Getting there is a measuring job rather than a guessing one. Measure a loaded round at the neck, decide how much tension you want, and buy the bushing that lands on that number. Sizes come in small steps for exactly that reason. This one is steel. Match it to the die you own before ordering.