Shooting my Whitworth in .458, I find that the 500 or 510 grain bullet at ~2100fps is 'easier' to shoot than the 350gr bullet at 2450fps.

That 350/2450 is similar to some 416 loads, yet any typical recoil calculator would show up as 'not as bad' as the 510/2100

Having said that, I could shoot either of those two loads all day long in the rifle mentioned as it's built for the job, weighs enough for the work, and fits me properly.

For what it's all worth, when I got this 458, I also was offered a 416. I chose the 458 -mainly- due to the much greater bullet selection. There are lots and lots of .458dia bullets out there to choose from, some of them very affordable, not so much with the 416. Also, I see the 458 as a more versatile cartridge.

--Tinker