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Lee Collet Dies load more accurate ammunition than any other loading system. Nobody, except Lee, has ever dared to make a guarantee like this: the smallest group size or your money back. A collet presses the case neck against a precision mandrel to achieve a perfect fit with minimal run-out. There is no need for case lube. Cases last ten times longer, so the savings from just 35 cases will cover the cost of the dies. Maximum accuracy is usually achieved by seating the bullet out far enough to touch or almost touch the rifling. This provides the shot start pressure that the crimp normally provides. As a result, a dead length bullet seater is included to round out the most accurate reloading system ever created. These dies only size the neck in order to maintain the perfect fit of fire forming. Reload only cases that have already been fired in your gun. Not suitable for autoloaders, slide or lever action firearms.