For people who do reloading there are a number of different mechanisms required including the RCBS Neck Expander Body. Available for several different diameters this neck expander body is highly recommended when loading cast bullets for rifles in bottleneck cases.

The expander body has the ability to expand the neck of the case while also flaring the mouth slightly all in one easy step. For accurately seating bullets without shaving off lead and to ensure perfect bullet weight on both sides this is the ideal accessory. Expander plus are available but sold separately.