The Lock-Out Die detects a "no powder or a "double charge"condition in the progressive reloading process. Ot locks up, halting travel of the ram, alerting the reloader to the problem so the cause can be corrected. Will not let you continue without removing the improperly charged cartridge. For use with straight-wall pistol calibres, 9mm and larger, and only on progressive reloading presses.
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