Dies Factory Crimp 30-30 - Lee
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Crimps bullets in place the same as factory ammo. A collet gently, but firmly squeezes the very end of the case into the crimping groove, exactly the same as factory ammo.
A firm crimp improves accuracy because pressure must build to a higher level before the bullet begins to move. This higher start pressure insures a more uniform pressure curve and less velocity variation, which is necessary for hunting and combat. Ammunition will be more accurate and better able to withstand rough handling.