I have a difficult time believing that any barrel, old or modern, could withstand proof pressure 9" from the breech.
I gotta call BS on that one.
It would be a pointless test anyway.
Perhaps they have jacked up the loads so as to carry more pressure down barrel, but max pressure at 9"? The pressure there should be 3,000 psi or so, why in hell test it at 6 times that?
How would you even build such a cartridge? With TNT and a 1 millisecond delay fuse?
Call BS on this:
wwwgunproof.com/PROOF_Memoranda/RULESOFP.PDF
Pay attention to part IV, "The Proof Load" number 27, part A, that calls for a load of 30% over mean service pressure at a point 17mm or 25mm, and at a point 162mm from the breech face a load of 30% over mean service pressure.
Two loads, two different places where peak pressure is generated. I don't believe 162mm is exactly 9", but, that might be splitting hairs at that point.
Best,
Ted
