"I shoot deer slugs for fun" always seemed to be the rallying cry of guys trying to convince themselves they could handle the recoil of a big gun when I sold guns, no offence to the op.
There is a big difference between the slow push of a slug shot offhand, a couple of times a range session, and and the crack of a .338 WM from the bench when you are doing load development with 225's-250's.
I think No Warning Shots post was very good, we have to bear in mind that .338's are usually built on the same frame as 30-06 while delivering almost twice the recoil impulse.
The idea of 160 and 180 grain bullets in a .338 confuses me. Also my rifle seems to shoot better the heavier the bullet gets.
I am with NoWarningShot on this one, the .338 is quickly becoming my favourite caliber.