I had the same bulge on the bottom of my shells recently. I'm using a Sizemaster, but the crimping stations should be the same. Here's how I fixed it:
- Check the crimping assembly at the final station.
- Just above the plastic crimper, look for the small nut which secures that particular station in place.
- If that bolt is loose, the assembly won't stay perfectly straight and can create deformities at the bottom of the shell.
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