I've shot a .458lott once ( or actually 3 shots..), and that one was above my comfortlevel.. It also gave me a grave headache..

However, my Merkel .470 handles nicely, or, it is at least tolerable

So thats my limit! I find the .416 Rigby to beat me more than the 470 because of faster recoil, so I'd pick the 470 over that one every time.

I recon most men find that .458WM and .470 are pretty much the biggest guns they can handle well? That's probably one of the reasons why it was such a popular group of cartrides back in the old days- it did the work peoperly without undue recoil? I hate to say that a 505 (or 500J) would be to much recoil to handle..

I might go ahead one day and see if i can handle a 500NE, If I do, ill get one

How can You shoot these 500+ and keep 100% focused on the target without flinching? I don't flinch with my 470, but every fibre in my body wants to. I have to concentrate real hard to shoot well.
It does require a lot of "want to" to actually shoot the big bores...!