I shoot the 6.5 x47Lapua with a no turn neck(.293) I originally thought I would give the necks a clean up turn to make the necks more concentric but never got around to doing it. With new brass, in a 600yd match, this gun won group against 64 shooters. For the first time, on May 7th I shot in a 1000yd match and this gun had a 99 with 3 xs and a group of 6.1". I don't plan on neck turning yet. Perhaps it will shoot better. If done correctly a clean up turn can't hurt. Your call!