FWIW, all our North American ammunition companies introduced the pie crimp on their 12-gauge trap and 12-, 16- & 20-gauge skeet loads about 1938. DuPont got the pie crimp out on their Peters High Velocity and Remington Express in 1946. It took the Olins a bit longer, but they got the pie crimp out on their Western Super-X and Winchester Super-Speed by 1948.
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