The one thing I can think of is if you rest the stud on a block of wood or something hard with no give . When you use a bag or other rest the weight of the rifle is dispersed over a bigger area of the forearm . Maybe when the gun is resting on just the stud it can put to much pressure in a very small area of the forearm . I'm just throwing that out there , don't know if there is any fact to it . just a thought .
As of this date 8-18-14 at 6:42am I became a proud grandfather I guess I'm officially old