For scope mounts, rings and action screws I would follow the individual manufacturor's recommendations. Luckily with the internet, all this information is readily available. Scope bases you can pretty much go by the screw size and pitch, but all the rest of it may not be to the max, because you have to take into account crushing a stock that may not have pillars, or scope rings that may differ in the way they clamp or the material they use (Burris signature Z with inserts, for example).