RCBS makes a set of 12 gauge dies that applies a slight turned over crimp, similar to that used on a lead bullet handgun load. If used with a stiff overshot wad, this might be a good alternative. I have only seen this done on thin, drawn hulls, such as Magtech. Good luck!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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