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Energy diverted to recoil is determined by the ratio of bullet mass (weight) to rifle mass. In a pretty extreme scenario of heavy 200gr bullet fired from a light 5lb rifle, only 0.5% of the total energy goes to recoil, lowering MV by 0.25%.
Leaning into the butt stock increases the effective mass of the rifle, arguably. The argument is there is always compressible material between the stock and shooter's bone. It has delay effect. By the time the shooter's body mass shows up in the picture, the bullet is long gone. For argument sake, let's say the rifle is solidly bolted to a wall, and no recoil is possible, MV will increase by no more than 0.25%. The load needs to have similar CV for this to be observable.
I'm afraid what Metal measured is due to something else.
-TL
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