Lee Factory Rifle Crimp Die .300 Ultra Mag

The Lee Factory Rifle Crimp Die .300 Ultra Mag is a precision reloading tool engineered for shooters who demand consistency in high-powered rifle ammunition. Designed by Lee Precision—a trusted manufacturer in the reloading community—this crimp die serves law enforcement, military, and civilian precision rifle shooters who load for the .300 Ultra Mag cartridge. Whether you're preparing match-grade ammunition for long-range competition or building reliable defensive loads, this die is purpose-built to reduce case neck runout and ensure proper bullet seating geometry.

The crimp die applies uniform pressure around the bullet's circumference, removing excessive case neck tension and creating a consistent platform for bullet engagement. This process directly improves shot-to-shot velocity consistency and tightens group spreads—critical factors in precision rifle work. Lee's proven design integrates smoothly into standard single-stage and progressive press setups, and the compact footprint (3.3 x 1.4 x 4.6 inches, weighing only 0.4 lbs) ensures efficient bench space usage. The die's construction and threading are optimized for .300 Ultra Mag dimensions, preventing headspace variance that compromises accuracy.

Reload enthusiasts working with .300 Ultra Mag platforms—including modern precision rifles and specialized hunting builds—will appreciate the repeatable results this die delivers across high-volume production runs. Competitors in long-range tactical events and hunters pursuing game at extended distances benefit from the velocity and accuracy improvements that proper crimping provides. Compatible with standard 7/8"-14 reloading press threads, the Lee Factory Rifle Crimp Die integrates seamlessly into existing reloading systems without requiring additional adapters or modifications.