I may have missed something reading through this thread. With any older gun, I would be more concerned with pressure. Pressure and recoil have two different effects on the gun. Pressure is generated from the shell loading and if the barrels are thin, then problems happen. Pressure is based on the powder type and grains; and shot charge. As Bruce mentioned, recoil is based on shot charge and velocity. Felt recoil can also vary based on the gun weight and fit.
As others mentioned, have the barrels checked for minimal wall thickness. Additionally, find out the pressure being produced by the shell.
Ken
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