When I'm picking out boards for bows, I sometimes don't even look at the end grain. If I do at all, it's always last. I look at the edge grain first, and then the face grain. Example: if you're looking at a board which is 1" thick, 3" wide and 70" long, I look at the grain on the 1" edge first. Then the 3" face. Is the grain straight? Does it run parallel the entire length of the board? Are there any grain run offs? If you answer yes, yes, and then no... grab the board. Grain first, wood type second. I'd rather make a board bow from a staright piece of maple or oak, than a really bad piece of osage (we're talkin' boards here, OK?).