I've never used a bore guide in any of my rifles, so this post may be "too late" according to experts who state that more barrels are ruined by cleaning rods than by shooting..... So, is it too late, or should I be using a bore guide, and if so, which one? Need something to work in 223, 243, 7mm, 300wsm, 308...all bolt guns except 223 is an AR..... :thanks: