That's a good looking bullet, Altamaha. LBT Blue's good stuff too.

A standard M98 works just fine for a .458 Mag. The rails need to be opened up a bit of course, and the bolt face modified.

The 500gr. Lee gas check bullet, dropping from the mould at 506gr. in WW alloy, was good in my .458 Alaskan right to 2,200fps. At that speed, it held an inch at 100 meters off bags. It also had a 23" on a M70 action. The recoil was to much for me, so I set the barrel back to the neck area, then re-chambered it to .458 2". I was much happier with a 400gr. bullet at 2,150fps with only 51gr. H4198, instead of the 62gr. Re#7 it took to get the same ballistics in the larger .458 Alaskan.