I have used these for seasonal adjustments on shotguns (where it matters more) with good results. As you see the barrel nut threads into the wood stock and whatever pad you choose fastens to the nut with a machine screw. Thick pad for early season, thinner for late season. Or use spacers. Much easier than fighting wood screws and no danger of loosening the screw hole. Wouldn't be my choice on a fancy gun but works well for field guns.

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Gun Nut II - Brownell's

The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh

Which explains a lot.