Ive had 375's that would stack 3-4 shots in a ragged hole at 100 yards;and hold sub MOA to 400.
That good enough?
The rifles were all pre 64 M70's in 375 H&H. One had a light contour Krieger barrel.
But with a Krieger or Bartlein tube what you want is not hard.
I pay no attention to accuracy "guarantees". Many times accuracy guarantees that don't materialize are the shooters fault anyway.
There are smiths who can build what you want.
