I did it a couple of years back with 12ga shells. I've seen it referred to as a swedged crimp - slight roll over without the over. If I remember I used a Lee reloader. One of those chromed models in a small box with about 4 or 5 attachments. The crimping tube has a smooth taper to the one end. Because stack height is so important, it's hard to do. Good luck. Maybe a Mec SS could be made to work. Or the final stage in a progressive press.
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Paul Harm
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