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Lee Factory Crimp Die # 90849.
The Factory Crimp Die crimps the bullet more firmly in place than any other die with more uniform pressure. The Factory Crimp Die features a collet that squeezes the case mouth into the crimping groove for a firm hold. This is the same type of crimp on factory ammo. It is nearly impossible to buckle the case when crimping when compared to a regular roll crimp die. Lee's testing has shown that using a Factory Crimp Die provides a more uniform pressure curve, increasing the accuracy of any bullet.
