Re: 338 Edge build question
Remington 700 LA from a chrome moly donor rifle in 300 RUM. Then have one of these excellent smiths on here true it up for you and install a Wyatt box.
Or get a Stiller Predator LA mag bolt face, but you will have to buy BDL floorplate, follower and spring for it.
If you don't ever plan on selling the rifle, I would go the Remington action route. If there is a chance of selling it in the future, go custom action. for some reason they seem to hold their value more.