RCBS .300 AAC Blackout SB Taper Crimp Die Set Grey

Overview

RCBS brings decades of die-making expertise to the .300 AAC Blackout SB Taper Crimp Die Set. This precision kit is purpose-built for AR-style and semi-automatic platforms, combining strong materials with careful finishing to support consistent ammunition components. The set is designed to endure the rigors of regular reloading sessions, delivering dependable performance across loads while maintaining tight tolerances that matter for reliable chamber fit and crimp control.

Crafted from case-hardened steel, each die undergoes meticulous drilling and reaming to align with exacting standards. The full-length sizer is designed with vents to prevent trapped air and excess lubricant, helping protect your cases during resizing. The seater die integrates a built-in taper crimp, ensuring a controlled closure on the bullet to maintain consistent seating depth and bullet alignment. Headspace is held to minimum tolerances, helping to minimize changes to case body length during full-length sizing. This combination of design choices, hand-polishing, and durable finishing aims to deliver long-term use with repeatable results.

Key design features

• Small base sizing die paired with a taper crimp seating die
• Optimized for AR-style and semi-auto reloading workflows
• Made in the USA with durable, case-hardened steel
• Precision drilling and reaming for consistent internal dimensions
• Headspace controls help maintain case length through sizing

Practical benefits for reloaders

• Supports smoother operation on progressive presses
• Designed to reduce case damage during sizing and seating steps
• Promotes consistent seating depth and crimp for uniform results
• Durable construction aims to withstand years of use