5/16's looks a lot better than 3/8's; most of the older rifles don't have heavy rods. I hardly use the rifle rr, anyway, but I bought a 5/16's synthetic for carrying on the rifle away from the range. Otherwise, the 5/16 wood rr is there for looks, although I have used it a couple of times just to make sure it works and am interested in finding a nice short range load that will load reliably with nothing but the rifle rr, i.e., no short starter and no range rod, as I feel that is almost certainly how the old timers would have done it when afield.