I would have thought that what breaks your stock is the Force of the explosion which a function of mass time acceleration.
The velocity of the projectile is important but the time it takes to reach that velocity (acceleration) is More important. A slow burn that gets the shot to its max veloctiy near the muzzel will put much less force at the stock head than a fast burn that gets it there 6 inches in front of the shell. I am not sure but I think pressure may be more proportional to Force than inertia which is mass times velocity which I think you have been talking about.
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