Several I know of have screwed in a small shank 338 Edge in a donor Savage Action, such as a 7mag is a donor. I am one of them.

Do it at your own risk. I mostly use 160 to 225 grn bullets in mine. 300grns bullets with 90+ grains of powder is potent, especially on your shoulder.

I don't think anyone would make you a small shank 338 Lapua barrel.