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In a perfect world, we would buy a box of ammo which is usually 20 rounds in centre fire and take a couple of shots to ensure your zero is still good down range. If you were to buy another box even from the same manufacturer with identical specs you would repeat the same.
Why you ask? Different lot numbers may bring variations. This is splitting hairs for the occasional sportsmen / hunters but would hold true for competition shooters if they were utilizing top quality ammunition IMHO.
It would be considered calibrating a tool / instrument.
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Because the scope or sights might have been knocked out of alignment I sight in every year. I also practice off-hand shooting a couple of times in the off-season. I also take the shotgun I use for upland out for a couple rounds of clays in advance of the season to adjust from a single trigger o/u to a double trigger sxs with an auto safety.
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Noticed the action screws on my gun were loose last year making my gun shoot 8" high at 20 yards. Torqued them down and gun was dead on again.
Always sight my gun in BEFORE any season, If I miss its 100% me, Not the gun. New ammo or not.
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As my mentor used to say " They come in a box of 20 for a reason...15 for practice and confirmation and 5 for hunting. "
