Gee, guys, 1986 is old? Not long ago I fired some .45-70 made in 1884, and it went off.
The ammo companies have been asked how long ammo will last, given good storage (cool, dry, sealed container). The answer is that no one knows, because modern powder and primers have not been around long enough.
A couple of years ago, the lab at what used to be Hercules was asked about powder life. They had samples of their powder made a century ago and every few years they take some and test it. They have found no significant deterioration in performance.
Anyone with a bunch of 1986 ammo that you want to discard as too old, please sent it on. I'll even pay the freight.
Jim