with taper crimping, after you size a case measure the outside diameter of the case mouth. then when you setup you crimp die only crimp enough to return the outside diameter to the measurement you took. crimping more than that will actually cause the bullet to loosen in the case and setback creating overpressure and possible kabooming your gun.
taper crimp is for removing the case mouth bell only. it is NOT for pressing the case mouth into the bullet.
the other type of crimp is roll crimping and those dies are used with cannelured bullets to roll the rim of the case slightly into the cannelured ring around cannelured bullets. never ever use a roll crimp on a cartridge like 45acp 40sw 9mm etc that spaces of the case mouth.
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