I recently read a comment by him in a question and answer section in a gun magazine where he said Damascus shotguns were unsafe to shoot. I emailed him saying the British proof house still proofs Damascus barrel guns for nitro, and if they're so unsafe, why would they still pass them. Also mentioned Sherman Bells testing in DGJ and all he said in his reply was " as long as American shotgun shell manufactures say they're unsafe, I'm sticking with them". Maybe that's what qualifies him as an expert.