I've a friend who shoots 165gr. TSX in his 16X16 X 7x65R drilling. This rifle barrel is VERY thin from 1/2 way down to the muzzles - perhaps .060", yet the TSX's didn't damage the barrel one bit. This rifle puts 3 into 3/4" at 100 meters and has fired over 200 of them. Perhaps it's only a case of the German steel being considerably better than the steel used in English Doubles?