There are many recoil calculators on the internet to use. All of them require the weight and velocity of the mass of everything that goes out the barrel over the mass of the gun. So , with that in mind And assuming the weight of the test gun is constant and the weight of the gas propellant and wad is roughly the same , the faster loads have more recoil. We have said that these are all 1 oz loads , so your choice to reduce recoil is to shoot a load with less fps or use a heavier gun. So the Remington and RST loads have the same recoil energy with 1200 fps and the others have less , with 1165 fps, etc.
Note that chamber length, angle of forcing cone , choke , size of shot , and design of the wad have nothing to do with recoil foot pounds.
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