OK guys, I'm taking a poll here and wandering how you'all break in your new bbls. I have told several customers on what they should do, but they never do! My last customer, bought a 408 c-t from me and he is having trouble getting it to group. After checking everything over several times i have found nothing loose. So i asked him on how he has been cleaning it. He said: after 25 shots or more(YIKES)with a electronic cleaner system. Do they work to good or remove to much of the fouling exposing raw bbl? I dont think the bbl has ever been broken in. After I shot the 408 and cleaned it with butches, took it back to the range and it shot very well, not a flyer on the target, a 7shot group was in one big ragged hole. Thanks to all who respond.