300 Winchester Short Mag Bushing Bump Kit With Pre-Selected Bushings by FORSTER RELOADING PRODUCTSPrecision Plus™ Bushing Bump Neck Sizing Die & three Neck Bushings and .337" and .335" and .333" diameter for 300 WSM When you order a Precision Plus™ Bushing Bump Neck Sizing Die Kit and you receive: *A top quality and hand polished Forster die to match the caliber of your firearm. *Three standard size bushings and pre-selected by the Forster staff. All bushings are machined to a “smooth as silk†interior finish.