Wouldn't more of a jackhammer motion allow bristles to clean the corners of the grooves better rather than a circle motion across the lands?
Edit to my post. Would most likely try the drill with a bronze or nylon brush in the chamber where a carbon ring or build up starts from forward of the neck to the lands. wouldn't run the entire length of the barrel. I try to run any brush from breach to Muzzle only one way.I bore scoped one of our .260 Rem and had some copper buildup and started to get a Carbon Ring. I was going to turn out the DRILL on it but didn't get around to it. I was cleaning with Montana Copper Killer and then letting Kriol sit in the barrel. Well that was about a month ago and decided to get to our range today. I didn't get to break out the drill yet. So last night I sprayed some Gunscrubber down the tube to clean out the Kroil put some patches through then G-96 with some more patches.
I fired a foul round then two in the same hole @ 100yds. Ran 300 to 800 yds targets and then four dead center on a 6" plate at 966 yds.
One of my most accurate shoots.
I wanted to try the drill and bronze/Nylon brush. Will have to scope the chamber and again when I start to loose accuracy.
That's a great way to ruin your barrel, never use abrasives especially with a drill or bore brush
You and anyone else using abrasive brushes with JB, especially guys power cleaning, should read this thread.I've used Kroil/JB Bore Paste for years to get stubborn copper out with no issues.