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In my saved pictures of Parker Bros. hang-tags from around the 1923-time frame I see lighter 12-gauges targeted with 1 1/8-ounce and heavier guns targeted with 1 1/4-ounce. So, 1 1/4-ounce of #7 chilled would be 374 pellets. That would be 255/374 = 68.2%. My table shows 336 in 1 1/8-ounce so 255/336 = 75.8%. I'd say 68% is more reasonable. Damn few guns patterned over 70% back in the day.
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