Here's my pattern-welded barrel carding setup. The wheels are .003 wire, three inch diameter wheels with one inch wire length. One wheel has four rows, the other has two. They are mounted in VSR drills. The four row is used for the overall tubes, the two row specifically for rib joints and lump/hanger areas. The drills are leaning on the barrel fixtures, designed so the barrels can be rotated easily during the process. The steel comb and file cleaner are used to dress the wheels between each set. So far, those wheels have done around 40 sets.
With the tubes mounted with breech to the left, and working from the center of the set, wheel rotation when working towards the breech is clockwise, so they "roll off" when at the edge rather than coming down on it. Reverse for the muzzle, wheel spinning counter-clockwise.
I use corded drills, but when using cordless, it would typically take one entire battery charge (18 volt Dewalt) to do one set. The paint brush is for dusting after carding.
Once done with the wheels, it's important to go over the tubes with 0000 steel wool. They should feel slick. Areas with "drag" need additional carding, either with the steel wool or with a wheel.
Regards
Ken
