Mike , you are quite right, the conversation had gone a little off topic.

As I said a couple of paragraps before. If what we are discussing is the apperatus that 9.3 has then it is not what I have seen refered to as a "sled". So I have no real idea.
However on general principles if the butt is hard against anything, be it a shoulder or a wall then the energy has to go somewhere. If it is a shoulder then the body and the person moves to absorb the energy. If it is a wall then the stock will have to absorb all the force by compressing or bending. Now at what point in between those two extremes damage will/may be caused to the stock I do not know. I would depend on the ammount of deceleration that the stock can cope with before splitting. If the rate of decelleration can be adjusted to replicate that produced by the human body then no damage should occur to the stock. That having been said however most of us have seen stocks split about their crossbolts when they have never been fired other than from the shoulder.

Regards