Back before Dick's went full woke I would purchase ammo when on sale, usually WWB or Blazer. Around 2017-18 Blazer Brass was offering rebates on bulk (350 rds.) 45 ACP at the same time Dick's was having a sale. Don't remember exactly, but it was a great price per round, even lower than online so I bought two boxes. Recently, I had an empty 50 cal ammo can and I figured I'd open the Blazer boxes and put them in the can. The ammo was packed in zip-locked bags in the boxes. Today, I grabbed a few hand fulls from the can to bring to the range. Upon inspection, the bag I grabbed them from was actually 40 S&W! Should have opened those boxes in the store I guess, at least I didn't try shooting them through my 45.

That happened to me with 12 ga ammo. I ordered 12 ga and was shipped 16 ga. It actually worked , but would not eject in my semi!! Never looked at the box.