The 6x45 barrel arrived yesterday. I gave it a close inspection and everything looked good. Mounted it up last night and snuck out to the range at lunch today. It was the warmest it is supposed to be for 4-5 days. Yep, a balmy 10 degrees. I only took ten rounds with me and I was able to get close to the bullseye and do a little tuning with 5 rounds. I shot the last 5 for a group. Because it was 10 degrees and I was on my lunch break. I shot off my mirror instead of setting up the bench. Inch and a quarter group. I know I can cut that way down by shooting off the bench and tayloring the ammo for the barrel as this is ammo I had loaded for another rifle. I'm happy with my purchase!