I have been shooting Score Benchrest since 1999. I have gone through a lot of different cleaning methods during that time. I have never shot anything except 30 Cal rifles during this time. I began by cleaning after every relay, like most of the others did. I then decided to clean every two relays, then twice a day and finaly, only after I get back home or if I am at a multiple day shoot, at the end of the day and then a very sparce clean. I have been using coated bullets most of this time and believe that there is less fouling by using coated bullets.
Some time ago, I read a post by Mickey Coleman, I think it was, who said that he takes the .0000 steel wool wraped around a brush to his barrels every so often. A few weeks ago, remembering that post, I deided to give it a go. I also thought adding a good dose of JB on the steel wool surely couldn't hurt anything. I have a rifle I have been shooting steadily all year and upon borescoping it I could see what looked like cracks that had filled up with carbon and some that looked like they had filled with copper. After 20 strokkes with the brush/steel wool/JB I patched it out and to my surprise the entire barrel looked like new, no hint of firecracking and no cracks filled with copper and carbon.
Since then, I am now cleaning all of my barrels this way. It is very fast and they sure are clean using this method. Like I said , I don't buy brushes damaging barrel bores nor do I believe that either 0000 or JB will harm a bore either. I have also had good results using IOSSO on either a patch or a nylon brush. When I want all the copper out I use Eliminator. It will flat take all the copper out of a barrel. I am also wondering if it is necessary or wise to clean barrels down to their nekked self. If they need to be fouled to shoot right, why take all of it out?