Theodore,
ITX has a Brinell hardness of about 50. Mild steel and iron have Briness hardness of over 100. There should not be a problem shooting ITX in Damascus since hammer welding should have harden the iron and steel of Damascus barrels.
I believe that with the correct thickness and firmness of wad petals ANY shot would not be a problem. Start with a VP-100 or similar wad designed for steel shot. If you are still concerned about shooting ITX add a Milar liner or two around the shot column. Make certain that the shot does not rise above the wad petals.
Mark
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