Ammunition Names and Terms Explained

What’s going on with the names of ammunition? What is up with these numbers like .223 or ? Why does this ammunition have Remington in the name when it’s made by Federal? What is the deal with shotguns being measured in gages? What’s the difference in all of these names? All will be revealed! (OK, not all, but a lot will be explained) Let me know if you like this sort of content! Photo Credits .380 ACP .38 Special .40 S&W & .40 S&W & .44 Magnum .45 ACP .45 GAP