The Bushing Bump Neck Sizing Die brings an advanced precision level to hand loaders by allowing you to precisely control the amount of neck sizing tension in your reloaded cartridge brass. The Bushing Bump Neck Sizing Die improves accuracy and prolongs case life because the necks are sized down as little as necessary while still "bumping" the shoulder of the case to maintain overall case concentricity and cartridge headspace length. Best of all, it prevents overworking the necks and allows you to control the amount of neck tension for your bullet seating operation. Interchangeable bushings are available in 0.001 in. increments to allow the user to customize the amount of neck sizing to adjust for case neck wall thickness. Forster neck bushings are machined to a superior interior finish for "smooth as silk" neck sizing. Order bushings separately.