I've always heard that when cleaning a rifle bore, one is supposed to go in the direction of bullet travel only, yet in several of my owners manuals, one being Barrett, the instructions essentially call for "scrubbing" the bore. I suppose my question is: why would this matter at all? The brushes are either a mop, made from copper/brass wire or even just nylon bristles. None of which are harder than steel and certainly not moving at a significant velocity. Does anyone have input? Is this just another Wife's tale?