Save it for a dull moment in camp, when everyone is about to fall asleep and toss it in the camp fire.
I was working at a Shooting Range in 1983 that pretty much got destroyed by Hurricane Alicia on the Texas Gulf Coast.
We had just taken deliver of about 40K 38 special wadcutter reloads from a Houston reloader. They wound up being buried under a bunch of ruble and stayed in their paper board boxes for a couple of weeks which were soaked with rain. After we dug them out, we peeled them out of their boxes as best we could and ran them through a cement mixer with walnut hulls. This cleaned them up beautifully, but after some testing, about 10% were duds. The owner wound up just giving them to me and I took great advantage of that. Me and one of the local police officers wound up shooting them up over the next year. I had a Smith Model 15 and 19 and I don't know how many NRA 25 yard targets we went through...but I know that not knowing if a round will go off or not, will cure any flinch you might have. I was probably shooting 200-300 of 45 ACP per week during the same time as I was shooting some IPSC and Bowling Pin.
We had a ton of factory rifle and pistol ammo that we wound up selling for about $0.25 on the dollar after making purchaser's sign a waiver of liability.
The shotgun ammo was too suspect to even chance that. Because the Range was a few hundred acres and shut down for awhile, the area between the rifle range and skeet/trap fields was used as a burn area for a bunch of the tree debris that the City collected.
We probably had close to 30 or so cases of shotgun ammo that needed to be disposed of...so me and one of my co-workers did what any 20-something guys would do. We tossed them into one of the HUGE fires that were going on at the time...pretty much a box at a time. At first we hid behind our trucks...but after a case or two...it was pretty obvious that they did little more than a little bit of a light show in such a huge fire.
I was also shooting about 20-25 rounds of Skeet per week. Best time of my life.
Joel