Our North American ammunition companies all introduced the folded "pie crimp" on their trap and skeet loads circa 1938/9.
Super-Trap folder inside.jpg
Xpert Skeet & Trap Loads 1938.jpg
New Remington Crimp on SHUR SHOT Trap & Skeet Loads.jpg
Hunting loads didn't begin appearing with the "pie crimp" until after WW-II. DuPont Remington/Peters began advertising them in 1947.
New Peters Crimp March 13, 1947.jpg
Winchester and Western began adding their Super-Seal crimp to hunting loads by 1948/9.
These "pie crimps" all showed up first on 2 3/4 inch 12-, 16- and 20-gauge loads. Slower movers continued with roll-crimps for some time.
Quote:
the shell they crimped was made in the early 1920 s for the new 3 inch long range guns it is not a magnum load yet..was the 6 point crimp better than the old roll crimp...i dont know thats what i would like to know..
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No your shell wasn't made in the mid-1920s. Winchester/Western continued to offer the 12-gauge, 3-inch, 1 3/8 ounce load with either chilled or Lubaloy shot well into the plastic Mark-5 era in 1969, where my catalog collection runs out. Whether the folded "pie crimp" was better was likely miniscule and you would never know the difference in the field. The Lubaloy shot was introduced in the Western Cartridge Co. Super-X loads circa 1929.