Box calls, scratch boxes, and strikers, are really the only ones that the grain makes a difference in IMO. The other calls mostly are just a housing or sound chamber for the call. Boxes you want the grain horizontal for the box and vertical for the lid or as close as you can get. The same for the playing surfaces on a scratch box. A striker you want the grain to run the full length, mostly because it's a lot easier to turn that way and a lot stronger, cross grain is a pain to turn.