I love my 458

Off a rest it's a moa rifle.
Yours likely is too.
I shoot the Hornady 350snrn at similar velocities as you're running the 405

I've also shot the long Barnes 350 spitzer copper TSX bullets seated long for big powder room (Lott charges) at over 2700fps, I forget the actual numbers, but they're ultra rippers.

Have fun with that thing!
Nice dogs too...

Cheers
Tinker