Are those #6 British #6 or U.S. Tatham? Are the Leader #7 U.S. Winchester shells?
According to the Hallowell & Co. chart, U.S. #7 and British #6 are both .10" and 291 per ounce. According to other charts I have U.S. #7 go 299 per ounce and the one on Vintage Outdoors says 300.
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