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Competitive shooters using rifles with heavy trigger pulls (3 to 5 pounds) have learned that they need to grip the stock's pistol grip firmly. Otherwise, their trigger finger doesn't stay put when the trigger's back against its stop and the rifle moves off its point of aim before the bullet clears the muzzle.
Folks shooting M1 and M14 service rifles in sitting and prone usually put their cheek hard against their thumb wrapped around the top of the grip so their cheek does not get smacked by the thumb; thumb and cheek go back from recoil together.
Even with light trigger pulls (less than 2 pounds), better accuracy is attained by wrapping ones thumb over the grip. This makes for more consistant trigger pulling.
If in any position with your thumb over a straight grip ends up smacking your cheek and you don't want to press your cheek hard against that thumb, add an inch to the length of pull by a thick recoil pad. Or put a spacer between the butt plate and stock.
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