Was at a gun show today and bought a box of mixed ammunition and this box was in the bottom. I thought it might be interesting. As you can see from the photos this is a box of, I believe, cyanide cartridges. As a kid I remember ranchers fields being posted “Keep Out Cyanide Guns In Use”. I believe these were the cartridges for these guns. I believe the guns being similar to the “Taylor Fur Getter” gun which was planted in the ground on the end of a stake and had a very short barrel loaded with these cartridges. The gun then had a long trigger that extended in front of the barrel and bait was wired onto the end of the trigger. As a coyote pulled to get the bait free the gun discharged firing cyanide in his face. Below are some photographs, though the box is a Western box, the cartridges are Peters and REM-UMC. The cartridges have a black substance just below the case mouth. Anyone have any further insite into these?