Here is a fact for you....
Take the recoil energy of a 30-06, add to it 50% of the recoil of that same 30-06. and that will give you a 338 win mag recoil.
In a standing position, even a 338 RUM is not that bad to shoot. But you need to remember, when your at the bench sitting, that 338 win mag will kick...... I will repeat..... It WILL kick about 50% more than a 30-06....I have seen guys coming into the range and thinking thier 30-06 "don't kick at all"..... they hold the gun lightly on thier shoulder and that sucker kicks and if they are scoped, hits them in the noise and thats it for the day. Bloody and nasty shooting bench.
I would also like to add, that im not trying to scare you away from the 338, I have one in a Browning BAR (semi auto) and I shoot it all the time, its kinda fun. Its soooooooo loud and makes a big 'THUD'; People around me hate sitting next to me but they love the fact that its a semi auto in 338 win mag. they go
--"oh my god is that a 338 semi auto"
--"yes sir do you want to try it"
--"no thanks"
Recoil wise, I have shot both a bolt action and a semi auto in 338 win mag..... to me.... I can't really tell the difference in recoil. they both kick good. My BAR did not come with a muzzle break (I was too cheap to buy one) oh well