Proper bolt placement is detirmined by the relationship of the componants in the lock and on the gun, not by a pattern of ideal placement.
You must clear the breeched barrel in the rear and hit the web between the RR hole and barrel channel in the front. You must also avoid the internal lock componants.
This will be different for every lock, stock and barrel combination and has nothing to do with the "ideal" placement.
This is one of the things most builders "lay out" on the stock, with all of the componants present, before they ever make a cut.