RCBS Supreme Die Set .300 AAC Blackout

The RCBS Supreme Die Set .300 AAC Blackout is a complete reloading die set designed for ammunition handloaders working with the .300 AAC Blackout cartridge. This versatile kit combines RCBS's full-length die set with an included shell holder and chamber case length gauge, providing everything a reloader needs to produce consistent, precision ammunition for both subsonic and supersonic loads.

The full-length dies ensure proper case sizing and bullet seating across the entire cartridge dimension, which is critical for reliable feeding and consistent ballistics in various platforms. The included shell holder positions the case precisely during the sizing stroke, maintaining dimensional consistency from round to round. The chamber case length gauge allows handloaders to verify finished case length before loading, preventing overly long cases that can cause feeding issues or excess pressure.

.300 AAC Blackout handloaders, whether developing subsonic loads for suppressed rifles or producing match-grade target rounds, will benefit from the precision this die set delivers. The cartridge's popularity in both civilian and professional shooting communities has made quality reloading dies essential. RCBS's reputation for dimensional accuracy ensures that users can rely on this die set for their reloading needs.