Ke is 1/2m (vxv)
Velocity change has a much greater effect on the recoil than the change of the charge weight.
Lots of people know that obviously you don’t
Recoil increases with the square of the velocity increase
You cannot reliably use whether or not an A-5 will cycle as a reliable determinant of ammunition suitability for an old shotgun
If you keep everything constant except for the ammunition you can use and A-5 to compare the various loads
But because of the complexity you are better off to use an old H&R single shot.
