Thanks for the feed back.

I was told that there is problems with floor plates opening and dumping the mag as a result of recoil.This and the reason that I like to be prepared with a backup mag already loaded.
I shoot almost every day as part of my work,so I would consider myself as a decent shot.
Most 458 lott's are only 2-3 shot mags and the 416 rem mag are 4 shot.I would hope that 4 shots would be plenty, but 2-3 shots and then have to reload near a angry bull worries me.
I have shot scrub bulls with a 308 and fail safe's on one occassion he went straight down, but on the other occassions it took multiple shots.This is why I would like a larger calibre, to make it more humane and quicker.
I have a 300wm Sako finnlight & a 45/70 & recoil isn't a problem.
Does the 416 rem mag perform better than the 458 win mag?
Cheers Phil