Consider a .458 American 2"
https://en.wikipedia.org/wiki/.458%C3%972-inch_American
While the .458 American is an efficient and useful cartridge, brass must be made... And can be formed from any magnum belted cartridge. The down side of that is that if brass is made from .300 Win Mag or 7mm Rem Mag, then the brass is headstamped and since it is a 2.5" cartridge, then the .458x2" cartridge can be fired in it. (with disastrous results.) One may not always own said rifle. And at some point in the future said rifle could cause serious injuries or death to some unsuspecting soul.
I have a .458x2" and I intend to destroy it before I die. The .450 bushmaster is practically the same ballistics with the advantage of being able to use factory ammo.
