Given that paper and tape shims work, if only as a temporary fix, I would guess there is not be much stress on the pin.
I think the force on the hook is mainly due to the mass of the barrels accelerating during recoil.
The barrel tubes want to basically stay motionless during firing. The reaction on the breech face pushes action and stock into your shoulder. As the action and stock go back, the barrels must hang on for the ride. This acceleration and puts force on the pin. For the same load, a heavy set of barrels will stress the pin more than a lighter set.
So I guess we could calculate the recoil energy, weight the various components of a gun, and by conservation of energy determine the force on the connections holding all the parts together.
If I am correct, the distance over which recoil is resisted will greatly affect the acceleration force on the pin. A lead sled contraption that sharply halts recoil will put more stress on the pin.
I say this is a lot like the forces put on rifle scope mounts.
Last edited by RyanF; 06/03/13 07:25 PM.
