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Unread 09-12-2016, 11:49 AM   #6
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Actually as early as 1926 --



However, the shell in question has the non-corrosive primer which Peters called "Rustless" so it is 1931 or later. The 10-, 12-, 16- and 20-gauges got the folded "pie" crimp about 1947 except the 10-gauge shells with BB shot continued to be roll crimped for some time?!?
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