I did notice the carbon buildup when cleaning, mostly on the breech plug. I remove my breech plug after every range session and clean it throughly (to a spit shine , so to speak).One or twowipes of the barrel followed by a light coating of #9 when I get home seems to be all it needs however.

I could clean it on the range like you do and if I see accuracy go south, I probably would. Thanks for the suggestion!