I have shot a few hundred rounds of 1 1/4oz Federal 3" Magnum Tungsten Polymer shot through my #2 frame 20g 3" damascus DH. It is choked a very tight .029 in both of its slim barrels. I have noticed no ill effects except on the ducks. I have also shot hundreds of rounds of Bismuth and Tungsten Matrix loads through a variety of damascus barreled guns in the pigeon ring without incident. Mr. Grilley "thinks" differently but properly wadded per BP's direction I would have no issue shooting ITX or Niceshot in a damascus gun.
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