Lee Precision’s Factory Crimp Die for .300 AAC Blackout (brand part no. 90590) incorporates a collet to apply a rifle-type crimp to the case, turning what can be a difficult cartridge to crimp into a straightforward step on the press. The collet is powerful enough to form its own crimp groove, so bullets don’t need a pre-cut crimp groove to get a secure hold. On a cartridge like .300 Blackout, run in both supersonic and subsonic loads through AR-platform rifles, a firm crimp helps keep bullets seated under the stress of semi-auto cycling. For reloaders standardized on Lee die sets, this reloading die adds a secure final crimp to .300 Blackout loads.

Key Specifications

• Chambered for .300 AAC Blackout.
• Uses a collet-style crimp to apply a rifle-type crimp to the case.
• Powerful enough to form its own crimp groove, so bullets don’t need a pre-cut groove.
• Classified as a Factory Crimp Rifle Die, run as the final loading step.
• Measures 4.7 inches in overall length.
• Ships at a 0.38-pound shipping weight.
• Adjustable via a set screw, letting the reloader dial in the amount of crimp applied.
• Accommodates a wide range of bullet types, including jacketed bullets.

Frequently Asked Questions

Do bullets need a crimp groove to use this die? No, the collet is powerful enough to form one, so bullets without a factory crimp groove still get a secure crimp.

Why does .300 Blackout benefit from a firm crimp? It’s commonly run through semi-auto AR-platform rifles in both supersonic and subsonic loads, and a secure crimp helps bullets stay seated through cycling.

When in the loading sequence is this die used? As the final station, after sizing and bullet seating.

Buy the Lee Precision Factory Crimp Die, .300 AAC Blackout

A secure final crimp keeps bullets seated through semi-auto cycling, and Lee’s collet-style Factory Crimp Die delivers one without needing a pre-cut crimp groove. Order it from our Lubbock, Texas gun shop for fast, insured shipping.