New virgin brass typically runs a few thousandths less head clearance than minimum chamber headspace. Since you're only reloading its not a big deal resizing the brass to fit the chamber provided your die and shellholder will allow it. Now, if you have to shorten the die and or use a holder with less deck height you may want to use the gauge to reset the HS and fire the brass as-is. Its six of one or a half dozen of the other depending which way you want to go.
Bill
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