This reminds me of my father telling me how hard it was to get shotgun shells during WWII to hunt with.
During the war, he said he only shot when he knew the round would be lethal on the game he was shooting, because ammunition was so hard to obtain, especially shotgun shells and .22 rimfire, but if you had something odd, you could likely find ammunition for it.
The only way he could get shells was because he was friends with our local state representative who was on the draft board, CD, etc. When the rep got a box of shotgun shells, he'd split it up and give five rounds to each of his friends that needed them to hunt. It went on like that until father was drafted in 1945. He was sent home from training when the war ended.