Going through Cartridges of the World (12th edition) I was Curious about the age of my ammo. It's not that old just wanted to find out when it was developed! This is what I found, 22lr,1887.12ga, early 1880's. 38 special,1902.9mm parabellum,1902.45 acp,1905. 357 magnum,1935. That's just handgun! Rifle rounds, 30/30 Winchester,1895. 8mm Mauser(.323)1905 and the youngsters 7.62x39 Soviet(M43) 1943. This is what I have. Now some young guns(pun intended) 308 Winchester,1952. 223(5.56x45)1957. 10 mm Auto,1983, 40 S&W 1989. So, how old is your favorite SHTF cartridge?