RCBS .348" Steel Neck Sizing Bushing

RCBS neck sizing bushing in steel, .348 inch. It fits inside a bushing style neck die and sets the outside diameter the case neck is sized down to.

Bushings are sold in one thousandth steps because the useful range for any given cartridge is narrow, and the right one depends on the neck wall thickness of the brass in front of you rather than on the headstamp. Measure a loaded round, decide on the tension you want, then buy that number. Steel bushing. Confirm what your die takes before ordering.