RE: A Bolt barrel not centered in stock...how to fix?
Try removing the action from stock and re-mating. If it's off centerd still then I wouldn't do anything until I shot it to see how it performs. My 270 abolt was off centred&shot very well out of the box.
If you get a walking poi after heat up due to stock touch, canhawg some material along the channel with a dremel tool. Just make sure to go slower rather then faster.
Like RR mentioned possible that the lug was bedded improperly at the factory. This can be tackled by gun owners who have worked on bedding isses orgunsmith if you prefer. I suppose you could see what browning would do for you! However if it does not affect the guns performance then you may geta PFO response as well?????