I own and shoot seven damascus hammerguns , and friends at my club shoot ten or twelve different damascus guns and no one has ever proofed, or had them proof tested. My wife and myself, who both shoot damascus guns, go through 30 to 40 boxes a week - with no problems. All a proof load proves is that the gun held up one time to extreme presures - nothing more, nothing less. Does someone really think the damascus gun held up for over a hundred years and was unsafe ? Just use a little common sense when checking it. Modern guns just like damascus guns can and do blow up if miss used. Everyone I know uses shells under 7000psi in any older gun , damascus or otherwise. Paul