I don't understand why a roll crimp or a pie crimp would make any difference?!? A 2 3/4 inch shell is the fired length and it is the same whether it was loaded with a roll crimp or a pie crimp. In the mid-1890s all the U.S. shells came with an overshot wad and a roll crimp. In the U.S., the pie crimp was introduced in about the 1938 time frame by Western Cartridge Co. on their Xpert Super-Trap and Super Skeet loads, and Winchester Ranger Super Trap and Super Skeet loads. In 1948, Western's Super-X and Winchester's Super-Speed hunting loads got the pie crimp. Similarly the Remington Shur Shot and Peters Victor trap and skeet loads got the pie crimp in the late 1930s and the Nitro Express and High Velocity had them by 1947.
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