I find that the Grizzly file that has no file grooves on the narrow side cuts a sharper serration than one that has the file grain on all four sides. I have found that on cow hide that the serrations that I do cut the full blade width and take less pressure than a smooth shaving sharp edge. I would like to advise that there is a vast difference from a broadhead that starts out shaving sharp and serrated with the two sided file than one that is filed but not shaving sharp and then raked with the four sided file. On a good hit they all will work, and all of the arguments have their merits. If using a standard Hill and the file sharpened edge instructions from Hill is done and seems quite keen and you do not have the ability to get that broadhead shaving sharp go ahead and use it. But experiment to find out how keen you can get that edge to decide what your sharpness standard is with it. That is the one nice thing about the single bevel, it can be made sharper with either technique than a standard Hill, but I have killed a bunch of deer with the standard sharpening instructions.