All good advice.
However, once they replace it, you still will have a rifle with a stock that may not fit. Production economics being what it is, many factory stocks do not fit the bbl'd actions well at all.
I rebed many rifles and all Rugers. Following principles apply to all bolt guns;
Make sure the trigger guard screws do not contact the stock.
Make sure there is relief behind the tang. The wood should not touch the tang at the rear.
Make sure there is good solid contact at the recoil lug. This is best accomplished by epoxy bedding after hogging out material to allow good purchase of the bedding material. Rugers are just about the easiest bolt guns to rebed due to the "box" ahead of the recoil shoulder that allows easy filling with bedding material.
Apply a small dab of epoxy bedding to the rear tang area and then make sure the rear guard screw does not contact it.
With a .458 Lott, I'd just go ahead and epoxy bed it. I would not trust ANY Ruger factory stock to the cartridge. I normally freefloat barrels but for heavy kicking rifles like the Lott, full length bedding can add an additional measure of strength to the stock just fore of the action.
Relevant to the Lott, I corresponded with Jack Lott for a time in the early '80's, and he sent me sketches of his method for bedding his namesake, and hea lways cut "trenches" in the recoil bearing areas and set small machine screws in the trenches and filled them in with epoxy bedding compound. No, you problem is not new.
Good luck.