Originally Posted by LDBennett
Over roll crimping will expand the mouth of the case so much the cartridge will not chamber in the gun. It causes the neck area of the case to bulge.
What is roll crimping? Read the sticky above on crimping:
Not a problem at all with the LEE carbide factory crimp die for pistols. It has a carbide post sizer built right in that keeps the cartridge dimensions to spec no matter how much crimp you put on them.
Must be what buffalo bore uses for their heavy magnum revolver ammo. Those guys plum ruin the cases crimping so much, but the rounds chamber and fire just fine...
I can see it being a problem in rifle rounds but unless you shoot cast, and require roll crimps, its a non issue there too...