I talked with the proof house in Suhl if they need a stock for proofing a rifle and yes they need something like that for the the two shoots to made.
because my plan is to let the gunmaker screw the barrel into the action, control headspace, maybe solder the sigth's on the barrel and than make the proof before more work is involved I made a cheap "proof" stock. it was in all a good idea because the mosin action is a little bit tricky and I had the chance to make some small mistake's. if the action is in the stock you can see much better where wood can be left next time.
so mill the walnut stock now was maybe not fun but I was knowing that its the right way.