I have seen/had a few English shotshells made of brass in my collection. They are quite thin when compared to the stout, lathe turned cases from RMC, and probably tolerate repeated crimping in the fashion described in the previous postings. A modern crimp starter would probably do the trick, seeing as how the crimp is not folded in completely. The MEC crimp starter is made of a machined metal, isn't it? Maybe it would be the right choice for use on brass. Cheers!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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