The RCBS Small Base Die Set Group A .308 Winchester is designed for reloaders producing ammunition for semi-automatic, pump-action, and lever-action rifles where reliable chambering is critical. The Small Base Sizer Die resizes brass slightly smaller than a standard full-length sizing die, helping ensure dependable feeding in rifles with tighter chambers.

This two-die set includes a Small Base Sizer Die with an Expander-Decapping Unit and a Regular Seater Die with a built-in roll crimp. The sizing die resizes the entire case body and shoulder to slightly below SAAMI minimum dimensions, while removing spent primers and expanding the case neck for easy bullet seating.

The seating die allows you to seat and crimp in one operation. If you prefer to seat bullets without crimping, simply back the die out until the crimp ring no longer contacts the case mouth.

Ideal for reloaders seeking maximum feeding reliability, the RCBS Small Base Die Set is an excellent choice for .308 Winchester rifles used for hunting, competition, or target shooting.

Includes

• Small Base Sizer Die

• Expander-Decapping Unit

• Regular Seater Die with Roll Crimp

Key Features

• Designed for .308 Winchester

• Small Base Sizer resizes cases slightly below SAAMI minimum dimensions

• Improves feeding and chambering in semi-automatic and tight-chamber rifles

• Expander-Decapping Unit removes spent primers and expands the case neck

• Seating die features an integrated roll crimp

• Seat bullets with or without crimping

• Built to RCBS quality standards

Die Comparison

• Full Length Sizing Dies: Resize the entire case to SAAMI minimum dimensions. Best for reliability, semi-automatic rifles, or brass used in multiple firearms.

• Neck Sizing Dies: Resize only the case neck. Often preferred for bolt-action rifles using brass fired in the same chamber and may help extend brass life.

• Small Base Dies: Resize slightly more than standard full-length dies, making them ideal for semi-automatic rifles and firearms with tighter chambers where reliable feeding is the priority.