Just for what it's worth concerning thin barrels and pressures. A few years ago a customer had a DH 20 Parker with Damascus barrels, at close to the mid point on the right barrel it was only .014 wall, I recommended he have it proof tested, so I ran two proof loads through that barrel, about 18,000PSI each. No issues so I fired one in the left barrel, again no issues. I realize this really does not prove anything, but indicates a thin barrel might be able to stand a lot of pressure, and yes, the triggers were pulled with a line and me behind a wall of the buiding.
