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Recoil is a function of conservation of momentum. The gun recoiling will have the same momentum (i.e mass*velocity) as the bullet accelerated to a given velocity plus the mass of powder accelerated to some average velocity. In terms of subjective felt recoil, a gun/ammunition combination with a higher recoil peak velocity will tend to feel more unpleasant than one with a lower recoil velocity given the same free recoil energy.
A more in depth discussion can be found in Hatcher's Notebook