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Unread 12-15-2019, 09:59 PM   #3
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The 12-gauge 3-inch progressive burning smokeless powder load came out in the late 1924/early 1925 time frame with the 1 3/8 ounce load.

12-gauge RECORD 3-inch Super-X two piece.jpg

To Owners of Super Fox Guns notice slip.jpg

LEADER Super-Speed 12-gauge 3-inch.jpg

By 1927, Peters were offering such loads.

Peters High-Velocity loads 1927.jpg

The 12-gauge, 3-inch, Magnum, load with a 1 5/8 ounce payload made the scene in 1935 along with Winchester's Model 12 Heavy Duck Gun.

LEADER 12-gauge 3-inch Super-Speed load label end.jpg

Super-X 3-inch Magnum.jpg
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