The most common definition of “caliber,” as it pertains to guns, is about as straightforward as you could want it to be: Caliber simply mean the diameter of the hole in a rifle or pistol barrel. Yet ...
This one replaced the .30-03 round among the US military back in 1906 which is why it got its name (06 as in 1906). Today, it is a popular bolt-action hunting round that can take down an animal of any ...