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Primers after pulling bullets

You can deactivate them with oil, then remove, and discard them. I have popped them out live, using my press and decapping pin, and reused them in fireforming loads, but I wouldn't recommend it to anyone else.
 
I'd throw them away, they're cheap and it's not worth gooning up a load trying to re-use them. Also, oil won't deactivate a primer like a previous poster said. It might work every now and then, but don't count on it.