Sorry I've only put one round through it off the back deck . I have to break the barrel in by cleaning the bore between every round for 5 -25 rounds, then do 3 rounds & clean, then do 5 rounds and clean until I don't see any copper fouling. This is Ballistic Advantage's routine for polishing the throat.
The one round I did shoot was Nosler 220g subsonic and the next round did load, I'll have to see if the bolt locks back on the last round. Having it cycle with subs is a pretty good start, if it's not consistent I'll try to tune it with the buffer.