When I buy factory ammo that isn't shotgun shells, I open the boxes to see what the production lot number is so that I can get ammo that was made during the same production run. MidwayUSA sends rimfire ammo as individual boxes even if you buy it by the carton of 10 boxes, so you're likely to get ammo from different production runs.
I usually buy a minimum of 5 boxes of centerfire ammo. 100 rounds, 10 boxes of rimfire ammo, 500 rounds, or 20 boxes of sabot shotgun slugs, 100 rounds.
