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Old December 4, 2012, 07:05 AM   #24
Senior Member
Join Date: June 17, 2010
Location: Virginia
Posts: 4,687
Two causes:

- What I'm seeing on the left (test) round appears to be more akin to a sharp roll crimp than a true taper crimp. What die set are you using ?

- Second, once such a roll crimp starts to bite into the bullet itself (without having a built-in crimp cannelure), it will collapse the case upon further seating. You can see that by the fact that the second (collapsed) bullet itself stopped moving into the case, and a large portion of the shank remains above the case mouth.

For now, seat in one step (no crimp); then unscrew the seating stem a couple of turns and crimp in a separate step.

The final cartridge should look more like this (ignore that it's a semiwadcutter and just look at the case mouth taper):

Last edited by mehavey; December 4, 2012 at 08:12 AM.
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