The bottom of the recoil lug shouldn't contact the stock. This ensures the belly of the action is in contact with the stock - offering the most contact area between the two. This also ensure there's room for bedding compound under it if/when you decide to bed.
As such, if you're needing to shim you should do so at the action screws and then bed the barreled action with the shims in place so they're permanent (or install pillars of the proper length).
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