Lee 300 ULTRA MAG and 300 H&H Factory Crimp Die crimps the bullet in place more firmly than any other tool. Tests demonstrate that even bullets which have no crimp groove will shoot more accurately. 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.

Features:

• Gives a segmented straight crimp, and crimps more firmly than any other tool
• It is impossible to buckle the case as with regular roll crimp dies
• Necessary for hunting and combat, ammunition will be more accurate and better able to withstand rough handling because the bullet is firmly crimped in place
• Tests demonstrate that even bullets with no cannelure will shoot more accurately if crimped in place with the Lee factory crimp die
• 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
• Even powder selection is less critical, until now, handloaders seated the bullet to touch the rifling to achieve similar results, this is not always possible nor desirable