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Could be for the 25 x 152 Philco Ford or the 25 x 155 GAU 7. There's loads of info about these CTA rounds in the book:
"Historical Development Summary of Automatic Cannon Caliber Ammunition: 20-30 Millimeter" by Dale Davies
Just put it into Google and download a free copy.
Note the groove around the base of the projectile, a plastic or paper washer fits into it, see photos below. They made ones with plastic and also copper bands.
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