Best rifle for 458 WM?

[Cheesehead]

My personal record speed-shooter weighs 9.0 lbs bare, empty, unloaded.
9 lbs 4oz with scope bases and Burris FF3 red dot added.
It is very comfortable to shoot with the Hornady 500-gr DGX&DGS factory loads delivering an honest 2140 fps MV:View attachment 643906

Hey, I've got one of those too! That rear sight is a little weird but the gun makes me happy.

Memo to self: I need to take better pics of my rifles

 

[RLL]

One more M70 Winchester Classic featuring a JES re-bore of a .375 H&H stainless barrel swapped onto another M70 Classic action and some fantastic wood,
A friend with more refined taste than I built this and I unburdened him of it after he took it to Africa and slew buffalo at 30 yards and plains game at close to 200 yards,
using the 404-gr Hammer at +2500 fps, all one shot kills:

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Question for you, Have you tested any other powders beyond AA2230? X-term, TAC, benchmark, W748?