I have a Mauser 8X57 mm sporter. It was a rather expensive conversion from military to sporter. The barrel was tuned to a new profile (still retaining the Nazi stampings), the bolt handle replaced with a nice turn-downed handle, all the metal beautifully polished and blued and, a highly figured stock fitted. Unless the guy was a gunsmith,it was a rather expensive conversion. BUT, it only shoots 3-4" groups.
