Re: working up a load will change stock after?'s
Depends if the stock is causing any inaccuracy in the gun before the bedding job.
That is, if the stock is touching the barrel, and after you bed the action it no longer touches the barrel, there is a good chance the zero will move.
On the other hand if the stock is not touching the barrel and only not holding the action the way the action wants to be held, accurcy will improve but the zero might not move at all.