I did a test once , comparing my glass bedded custom M98 and a new Rem 700. Mine shot to original POI immediately when returned to the stock. The 700 returned to original POI after about six rounds .
I would assume this is typical .
Glass bedding is a good idea to strenghten the stock, resist warping from humidity changes ,and returning to POI after removing the action.
And Watson , bring your revolver !