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The Lee 40 S&W/10mm Auto Carbide Factory Crimp Die gauges the cartridge as it is crimped, ensuring that every round chambers freely and reliably. A taper crimp is applied with this die.
The adjusting screw quickly and easily sets the desired amount of crimp. Trim Length is not critical so this extra operation takes less time than it would if cases were trimmed and chamfered. A strong crimp is required for reliable and accurate ammunition, as it eliminates the issues associated with slow-burning magnum powders igniting improperly.