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Old December 27, 2012, 08:15 PM   #6
Gunplummer
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Join Date: March 11, 2010
Location: South East Pa.
Posts: 1,399
I go with JamesK. I would think it is 4140 and probably at the same hardness of a high power barrel. With all the lawsuits now days I doubt any one would order scrap barrels to build muzzle loaders.
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