I was able to get out to the range today and get my new Rim-X build dialed in and I am pleasantly surprised. I purchased a Proof stainless prefit in the 24 inch Comp contour since it was available and a good price. My plan is to use this rig next year for some PRS 22 matches. I've read some mixed reviews of Proof prefits, but I elected to take a chance on it. I also have a Cortina V2 tuner on the barrel, but never touched it. At this point, I'm not sure if it's necessary with this combo for PRS. The Rim-X fed all rounds flawlessly. I only shot 100 rounds today. The large black bull target was for initial scope sight in and then I shot three 5 shot groups at the left upper corner of the blue squares. All shooting on paper was at 50 yards and all were 5 shot groups. Looking forward to trying out positions next trip to the range!