Have you " Boned " the wood yet? That is done by taking a smooth piece of steel, or hard wood, like a hickory tool handle, and rubbing the wood of the stock oall over, under your hand prssure, to push the grain down, and give the entire stock a hard, almost slick surface. Its done usually after staining, which will often raise grain in the soft growth areas, which is traditionally removed with scrapers. You bone the wood after scaping off the raised grain, to harden the surface of the wood for the finish you apply. Maple varies in weight. I don't think you can tell much with the thumb nail test. All wood save, perhaps, iron wood, and ebony, possibly, is soft enough to dent with your fingernail.I have dented oak, and ash, two of our hardest American hardwoods grown, as well as hickory, walnut, and maple. A dried piece of ironwood might be a little harder, but I don't remember trying to put my thumbnail into it. There are even some hard " Pines ", particularly Yellow Pine, grown in the South that are pretty hard to dent when they have been dried.