Originally Posted By: John Roberts
If the chambers are rough, 4/0 steel wool will do nothing. Nothing. Send the barrel to a good smith and let him hone and polish it. Won't cost much.
JR

If the chamber is truly rough there will be highs & lows.
The object is to take the highs down. A flat hone stone will do this.
The steel wool will polish the highs & lows.
There is more to it than just hopping in with a coarse stone @ high speed.
John is probably right. Take it to a smith.
O.M