The Lee Factory Rifle Crimp Die features a carbide sizer, which post-sizes your rifle cartridges while crimping this guarantees that every round will chamber freely, just as it would straight out of the factory. This crimp die accommodates a wide range of ammo even jacketed bullets.To use the Lee Factory Rifle Crimp Die, all you need to do is adjust the screw to set the desired amount of crimp. This factory crimper is powerful enough to crimp even those bullets that do not have a cannelure.