The WSM should kick less with all else being equal. But by only 3ft-lbs or less. This is due to the energy equation puts alot of emphasis on powder weight. But real world, I haven't been able to feel any difference. Powder type really makes alot of difference in recoil and may not make a huge velocity difference. If you use a real slow powder with win mag, you will definatly feel the difference over using a real fast powder in a WSM but equal in velocity.