RCBS 15503 Small Base Die Set for .308 Winchester

The RCBS 15503 Small Base Die Set is designed for reloading .308 Winchester bottleneck cases used in tight-chambering semi-automatic, pump-action, and lever-action rifles. This two-die set helps produce properly sized cartridges for reliable chambering and consistent performance in firearms that may require more precise case sizing than standard full-length dies provide. The set includes a Small Base Sizer Die with an expander-decapping unit and a Regular Seater Die with a seater plug.
The Small Base Sizer Die resizes fired cases to slightly below SAAMI minimum dimensions, reducing the case shoulder and body by a few thousandths of an inch. This sizing process is intended to help cases chamber smoothly in rifles with tighter chambers or actions that benefit from additional sizing clearance. The integrated expander-decapping unit removes the spent primer while expanding the case mouth for bullet seating. Proper die adjustment and case preparation are recommended for achieving consistent results.
The included Regular Seater Die features a built-in roll crimper that can secure the bullet as it is seated, making it suitable for applications where a firm crimp is preferred. For seating bullets without applying a crimp, unscrew the die until the crimp ring no longer contacts the case mouth, then adjust the seater plug to achieve the desired bullet seating depth. Manufactured by RCBS, the 15503 die set provides a practical setup for reloaders seeking dependable case preparation and bullet seating in .308 Winchester ammunition. Always follow established reloading manuals and safe loading practices when using this equipment.

Features:

• Type: Small Base Sizer Die Set

• Caliber: .308 Winchester

• Die Type: Sizer and Seater

• Set Includes: Small Base Sizer Die with Expander-Decapping Unit and Regular Seater Die with Seater Plug

• Crimping: Built-in roll crimper for securing bullets during seating