Just a quick update: Did an abbreviated break-in procedure and load development a couple months ago. Using between 47 and 48 grains of my 20 year old IMR 4350 powder it’s grouping between .5 and .6″ 3-shot groups at 100 yards anytime I want. Due to massive distractions I was only able to fire 40 total rounds, back when I did this. Hope to get back to it when things calm down. Have bought some Vihtavouri N550 powder to try since the 4350 can barely reach over 2900 fps with 140gr bullets. I am very happy with this barrel. I appreciate the excellent job you guys did in manufacturing it. Thank You!