Some slug loaders buy a roll crimper. I'm just getting into it so I'm no expert.
Google image "roll crimp 12 gauge slug"
I trim about 2/3 of the crimp away with scissors and just use my two crimp stations on my Lee Load All.
Google image "roll crimp 12 gauge slug"
I trim about 2/3 of the crimp away with scissors and just use my two crimp stations on my Lee Load All.