I finally got to try out that miserable 1/8 twist barrel today. I did cut a new crown and noticed that when the tool contacted the barrel it seemed to catch on the right side of the barrel. The new crown is now a 45 degree cut. I was shooting 75 gr Black Hills Match ammo. Results are fantastic. Groups now are under 1" @ 100 yds if I do my part from a rest. I guess I will not destroy that barrel. HAPPY HAPPY