[Adamantium]

I doubt the store will take them back, mistake or not. Ultimately it is the customers responsibility to ensure he is buying the correct product. Online is a different story because we don't have the power to be there when they pack the box but it doesn't sound like this is the case.

Of course this isn't a big issue because primer use is very flexible. Just drop your load 10% and work it back up to where you want it. That will take a whole 10-15 primers and if you are using a fast burning powder I doubt there will be any difference in performance.