If it is actually possible to over polish a barrel using JB products I would really like to hear about it. After what I did to one of my barrels, that I was planning on throwing away, I can't imagine how much time and effort it would take to actually ruin one. I am not recommending anyone do what I am about to spell out here, but just putting it out for general info. When I first looked down the barrel of my .25 Benjamin Marauder I could not believe how bad the machining looked. The chattering was evident and the choke tight and long. It was the first pcp barrel that I have seen that just looked bad. My Turkish, Chinese and German(of course) all looked good, comparitively. After cleaning it and pushing a pellet through I figured to throw it out and get a TJ's. So at this point I figured that I might as well experiment. I clamped it down with quick grips over a bench, so that I could get at it from both sides. Using a cleaning rod in a drill, with a long jag, with strips of rag covered in JB, I ran down the barrel from both sides for ten minutes each so that I would purposely hit both sides of the lands. Then I did ten minutes by hand following the rifling to get the bottom of the groves. Then I repeated the whole process using JB bore bright. I favored the muzzle by not putting the jag so much out the front as the rest of the bore. Then I ran patches until cleaned out and oiled it with mp5 then ran patches again. Between fiddling with everything, it took about 2 hours to do this. To do the amount of polishing that I did with the drill, by hand, would have taken all day. I pushed a pellet through smoothly and the choke was still, what I believe to be, too tight, but the markings looked good. So I decided to try it out. I never got the TJ barrel. Anybody can have an opinion, but I got a result. I am sure that there are abrasives out there that will take out your barrel. Don't use those, stick to JB products and you should be fine.
