Yeah,....mb's can be a pain in the azz to remove. Might have to soak it in a penetrating lubricant.
Pipe wrench with leather will remove the smooth nut, but unless he's opposed I would replace with the slotted. I think the 111 in 338 lapua is a large shank btw.
Clamp bbl in barrel vise and use rosin! then remove break. Although honestly I would leave it attached.
Secure rifle in lead sled or similar and remove the bolt. Stick a thumbtack in the wall and get it centered in bore, when looking through from the action. Then simply adjust crosshairs to tack. That will get you close. Or if you have access to a range use the target centered in bore to adjust scope.
Hopefully bbl threads are all in good shape. I can't believe you managed a 1/2" of rotation without the nut just coming loose!
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