Competition shooters in the prone position tend to have adjustable butt pads (even if made out of aluminium) and generally have them raised higher than the butt section. Competition shooters in the standing position usually have the adjustable butt pad in the lowered position, that is lower than the butt section. Of course, that doesn't apply to hunting rifles.
As ihmsakiwi says, "it's about having clear site picture without any neck & shoulder straining". One thing that helps in the standing position is to have your eyes level and your head straight up rather than craned forward - not always possible though. If your head is cocked to one side it affects your balance, especially in standing.
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