Friends:
The gas pressure at the muzzle is something like 80 psi - perhaps less. Remember the experiment performed by W W Greener, spoken of recently on this board, where he turned down the muzzles of a gun until almost foil thin, shot them successfully with no deformation, and then cut them off with a pen knife?
In reference to MG Hatcher's experiments with the .30-'06, You cannot generalize from rifles with breech pressures in the 55k psi range to shotguns with pressures in the 10k psi range.
Inertial recoil reducers such as "Dead Mule" work, because they spread out the recoil, or make time "t", go from very small to somewhat longer, which makes the perception of the recoil blow to be lesser.
I suspect the way to get from free recoil and its "Ke" calculation to felt recoil is to include a " time" component. It seems to me, Ke is "instantaneous". If the blow is spread out over some period of time, the ability to take that into consideration may get us closer.
Just ideas.
Regards
GKT
