.458 WM's attitude depends on how you load it and what the rifle is.
A lightweight Ruger #1 is going to be harder on the shoulder than a 13 lb Ruger or CZ bolt action.
I haven't owned one, personally, but there have been several in my family that I shot. And, when my father sold his, he asked me to "dispose of" several hundred rounds of reloads before the rifle went away. So... I've had a bit of trigger time.
Some of the funnest loads were with heavy bullets (~500 grains). There's plenty of recoil there, but it's a long impulse and doesn't hurt much. And the destruction at the point of impact will put a smile on almost anyone's face.
Some of the worst loads were with 350 gr bullets in hot loads. Snappy, violent, and painful, without much payoff.
Reduced loads were somewhat fun, but I'd rather have a lighter weight .45-70 than deal with a heavy .458 WM just to shoot .45-70 level loads.