Nails - what size(s) to use for light frame construction?
16d splitting depends on the hardness of the wood and whether or not you are at the end of a stud. at the ends, do your best to nail across different grains, as opposed to the nail being parallel to the board; that pretty well guarantees a split at the end of a stud. you can always drill the end of the board, too, but that is an obvious pita and an emergency deal. if nailing two studs together, angle the nail instead of going straight across. it will hold better, too, esp if you alternate the direction in which you nail.