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Old February 6, 2013, 08:59 PM   #5
B.L.E.
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Join Date: December 20, 2008
Location: Somewhere on the Southern shore of Lake Travis, TX
Posts: 1,904
277 grains is the theoretical weight of a .569 diameter lead roundball so that would be the minumum caliber. Taking account material lost during the impact, a .62 caliber rifle is very plausible. A rounball load in a .58 caliber musket is also plausible.
Time and weather should not reduce the weight much because lead oxide is actually heavier than the lead it used to be.
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