not to be obvious - since a bore is measured by the number of balls (think load) that size that come from a pound of lead
16 per pound gives you an ounce
or 1 1/8 oz for a 12
i have always assumed the standard load relates to the ball weight for that size bore
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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