In my neck of the woods, I've seen most hunters hold down that top strand of barbed wire with their buttplate. Those that don't often sing soprano. I have never seen anyone hold the fence wire down with their forearm. Could be a regional thing. As far as rings causing the damage, that could be a contributing factor. But considering how many hunters wear rings, I think we'd see a lot more guns damaged this way. The Vikings found out the hard way that Tru-Oil looks good, but offers scant protection from sea water and the ravages of time.