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Physics is study of energy transfer. When there is enough energy, it is possible. The question is how to direct the energy to the right place. I'm holding on to the hope. Experiments fail to make it happen. It is just that. They fail to make it happen. Not a proof to the impossibility.
Before this discussion cork screws into a philosophical debate. Let's go back to muzzle climb.
Shoulder on the butt stock. Average force on the stock 50lbf for 2ms. Center of butt stock is 5" below bore axis. The torque to raise the muzzle is 250 inch-lb. It is being countered by the weight of the rifle. The CG is usually right at the chamber about 24" from the butt stock. 7.5lb gives rise a torque of 180 inch-lb. The net torque to rotate the rifle is 70 inch-lb or about 6 ft-lb.
It doesn't take much to significantly change POI. For a 40" long rifle, the muzzle just needs to rise by 0.01" to move POI by 1" at 100yd.
There are actually ways to totally eliminate muzzle rise. The above calculation gives a few hints.
-TL
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