Finally got around to shooting my 300 WM with one of these barrels! Below is a pic of the first five shots out of the rifle with the first load. The left of brass was a fouler then there is a 4 shot group on the right. Did a break in cleaning after the first five rounds and this was the easiest cleaned barrel I have worked with in a while! Shot another five rounds with the first being a cleaning flyer. The other four would have been touching had I not gotten anxious on the last shot. Things are looking real good so far! I'll do another break in cleaning now and shoot another 10. Then actually do some load development. Load was Berger 200.20x/CCI250/H1000(75gr)/peterson 300WM.