To answer the question you asked. Minimum proof pressures in Austria for 16 ga. and above is 12,800PSI, for smaller gauges the minimum is 14233PSI. Proof loads manufactured by Remington produce pressures which exceed standard loads by as much as 50% and are clear plastic and marked as proof loads. Remember this when you remove a bulge from a barrel the bulge has already yielded once and removing the bulge forces the metal to yield again. Finally since I value my eyes above all my other senses I test Damascus guns I want to shoot by tying with the top rib against an 80 lbs. truck tire, adding 30 ft. of string to each trigger, lying face down on the ground with a hard hat, and pulling both strings one after the other. Yes I used proof loads and hunted the gun there after.
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