The correct way to properly dispose of primers is as such:
- Insert into the head of compatible brass case.
- Charge brass case with correct load of smokeless powder for the caliber/application.
- Seat correct bullet for caliber/application into brass case at correct OAL.
- At an appropriate location, load into firearm using applicable method.
- Minding proper firearm safety, discharge firearm.
- Repeat.
Sorry, couldn't help it.
In all seriousness, unless there is an obvious reason they should not be used, like they are heavily corroded. Just use them.
If you're not sure, load a couple tests round using data that is tried tested and true to you, and fire them in maybe, not your best gun.
If they work fine, you'd saved yourself a pretty penny in reloading supplies. OR . . . you're probably already getting PM's.