The only way to know is to have a good barrel man who has evaluated a lot of Damascus barrels measure the wall thickness and determine the depth of the any pitting. In other words, get a well informed opinion. Do not rely on a local hack gunsmith unless he really knows Damascus barrels otherwise he’s going to give you the usual CYA rhetoric about them not being safe.
The fact that they have been cut is probably not a concern because of the lower pressure at the muzzle. The determining factor is at the end of the chamber through the forcing cones where pressure is the greatest.
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