Bill: Dr Gaddy donated the damascus barrels from the Parker GH and the Vulcan Steel barrels from the Parker VH that had been the subjects of destructive testing by Sherman Bell, with the technical support of Tom Armbrust, published in The Double Gun Journal Vol. 10, Issue 4, Winter, 1999, “Finding Out For Myself” Part II and Vol. 16, Issue 2, Summer 2005, “Finding Out For Myself” Part IX.
Both guns were subjected to sequentially higher pressure loads at about 2,000 pounds/square inch (psi) increments. The GH testing started at 11,900 psi and one chamber ruptured at 29,620 psi. The VH started with a Proof Load of 18,560 psi. Both chambers bulged at 29,620 psi and ruptured at 31,620 psi.
Ron Graham performed a metallurgical analysis on both barrels and it is my understanding that he intends to publish the report, possibly as part of his evaluation of the other donated barrels (hopefully still) in his possession.
