I ordered a Rock from Russel in 260 remington. It was a blank so I got to choose contour and length. I went with the m24/m40 style 24", and I had him thread the muzzle 5/8 x 24. It arrived a in about a week and a half and is a nice piece of work. Screwed it on and headspaced. I went out yesterday to do an OCW test with RL17 and 142 SMK's. This was my first time doing this kind of test and it was almost useless to me. Everything shot to about the same poi, just moving right to left about an inch from 38-42.9 grains of powder. I loaded up two rl17 loads and three H4831sc loads for today. Wind was variable 5-15 from about 10o'clock. shot groups at 500. As far as I can tell this barrel is a shooter. Gun is a LRP action in a Mcrees Precision chassis, IOR 3.5-18x50