Quote:
Originally Posted by Bruce Day
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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This is correct, its really a simple physics problem. every action has an equal and opposite reaction. Sum of the energy in the longitudinal direction must be equal. The energy going forward being "pushed" off of the breach of the gun if you will, is directly absorbed by trying to move the mass of the gun and then your shoulder/buttplate or pad backwards. forcing cone, choke size, etc all would be in the radial direction and as such would be reacted against by the barrel, which in turn "pushes" back on the expansion of the gas and thats what causes things to go out the end of the gun.
Of course, you could make the philosophical arguement that eventually the barrel becomes so constricted the physics changes (squib loads and stuck wads)....but that only happens when the barrel reaction stresses can not contain the rapid expansion and thus you see catastrophic failure. The equations necessary to model this are highly complex due to the extremely short period of time it takes place in, you've departed classical mechanics and entered into the world of trying to model this as an energy strain relationship system, through some FEA or similar.
Source: My college research paper on system design which I wrote on load considerations to optimize the weight of the modern shotgun.
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