Well, squaring the ring face won't mess up your brake timing unless you're using shouldered barrels in lieu of a nut. With the nut the headspace remains the same provided you can reinstall the barrel back into it's previous headspace rotation.
What you may want to check however is the lug setback in relationship to the recoil shoulder of the stock and the action screws. Whatever amount was turned off will move the action ahead the same amount in the stock.
Bill
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