300 Win Mag Bushing Bump Kit With Pre-Selected Bushings by FORSTER RELOADING PRODUCTS Precision Plus™ Bushing Bump Neck Sizing Die & three Neck Bushings and .334" and .332" and .330" diameter for 300 Win Mag. 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.