I have found that felt RECOIL is very much about gun fit, recoil pad, etc.

As an EXAMPLE----I had a light weight double barrel 20 gauge Zabala that kicked very sharply. 3 inch magnum shells gave me a nearly instant headache. I cut the stock slightly added a 1 inch Limbsaver and totally altered the felt recoil. I would say the kick is now modest. And the gun is enjoyable to shoot. Yes same gun same 3 inch magnums. Thus, if someone asked does a 20 gauge side by side kick hard the answer would be "yes", and, then, "no".

So I do not think it is possible to say a 416 kicks less or more than a 458 because we all assess FELT recoil of any gun we shoot. It does not matter what the computer says, if you shoot a 416 and say OUCH! or if you shoot it and DON'T say ouch....that is what matters!

I have heard some guys say their 416 kicks harder than any gun they have shot and others say their 458 is a hard kicker while some said, very manageable.... as we all know, too, what matters so much is bullet grain and amount and type of powder. Hence every caliber kicks at various levels depending on charge. My 300 WinMag kicks radically different when I load it with 220 grainers verses 180's.