yeah thats one reason I bought a cz 458 lott.
I load and shoot mostly hard cast bullets and seldom exceed 2200 fps regardless of bullet weight,
it handles both the 350 grain and 400 grain hard cast bullets ,
but its longer case length, allows use of the longer 500-550 grain hard cast bullets
much better than the 458 win.
And a much better throat for cast bullets. Have you ever looked at a chamber drawing for the 458 Win Mag? Throat minimum spec starts about .010 larger diameter than the bullet and is a giant long funnel, not sure how any bullets pass through that without wobbling. Interesting point is that many of the CZ Lotts are factory rechambered Win Mags, at least the rechambering gets rid of the worse part of the Win Mag throat.
Win Mag p.151- (p.163 on my PDF)
Lott p.150-
https://saami.org/wp-content/uploads/2018/01/Z299-4_ANSI-SAAMI_CFR.pdf#page=13
