Harold, Because of the variations in the condition of damascus guns, I don't think there is a black and white answer to your question. I am no expert metallurgist by any means but common sense tells me that there is probably some degradation in 100 year old welds and solder joints in all doubles, especially damascus. For that reason and because I am proud of my hands and fingers and other body parts, I won't shoot loads in my damascus more than 7,500 PSI. This is my personal limit, I am sure others have different opinions and I surely respect those. Again, just my personal limit.
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