If you're sure you loaded with the RL-19, pull the bullets, dump the powder and load with the correct powder - you may have to neck size the cases. The powder you dumped is still good. If I was really sure about which powder was which, I'd dump it back in the can and save it for later use.
If you're just the slightest bit unsure of which is/was which, dump the powder into your flowerbed and make sure never to have two cans of powder on the bench at the same time.
Easy mistake to make and one I've made myself.
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