I dont know Dave .... Im cutting out a sheath right now ... and my roundknife is great for the initial cut, and maybe the second slightly deeper one ... but then is seems to bind up in the leather, and I need to push really hard .... which inevitably leads to a slip of the knife, damaging the leather. probably it just needs to be sharper, with a shallower bevel than the factory edge??? right now I can not see making that cut in one pass (leather is TOUGH stuff.....)
(actually, right now, I am using the roundknife to make the initial pass or two, then needing to finish up with an exacto blade.......)