In Korea, I was assigned to assist another unit with their annual range quals. I was given a deuce and a half with a ton of ammo, stacks of magazines, and 10 US and KATUSA soldiers. We were told to load 20 round magazines until told to stop.
Problem was, nobody told us to stop. That unit was packing up, and I had a huge number of loaded mags. The officer in charge was aghast, and wondering how to put the genie back in the bottle, but being a resourceful NCO I had the answer. I had each member of my detail snag 4 M16's each, and we went to the firing line. I told them to fire full auto a max of 10 mags each, and then get another rifle, lather, rinse, repeat. We spent the next 45 minutes burning up ammo. Even with the limit of 10 mags each those rifles got hot.
I am glad that it was the other unit that had to clean them, as well as account for all the spent brass.