How to fix shotgun crimps with the heat lamp method

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I attempting to heat up the hulls of these 12ga slugs. The crimp just didn't look right so I am straightening out the crimp and heating the plastic to see if it makes a difference. I am told by seasoned shotgun re-loaders that they heat the hulls prior to loading to make the thicker plastic crimp better. i figured I would give it a try.

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