Wood gunstocks are pretty fragile through the pistol grip. The grip itself is small, wood is directional, and the forces that can be applied against it are considerable. Horses are death on stocks. You never, ever leave your rifle in the scabbard when you dismount, because it is at this precise moment that Old Thunderdent is going to develop an itch under his saddle blanket and is going to have a good roll to get rid of it. A half-ton of horse rolling on your stock will pretty well do for it.