I have a small stock of large rifle primers that's been stored in an unheated non air conditioned garage for 3 or four years. Will this any effect on their reliability?
Somebody will be along shortly to offer to test 50% of your stock for free.
I'm at the NW corner of MS. The last hurricane that moved through the area left us 2.4 inches of rain. The next evening I'm sitting at the fire pit and spotted a silver dot in the dirt. It's a primer, no clue how long it had been there, maybe 5 years. It was full of wet dirt. Well, it's no good, won't fire so into the pit it went. 10 seconds and there was a loud pop that sent ash flying everywhere.