One of the ultimate ways to get versatility out of a firearm is to get one that fires multiple calibers or cartridges. When looking for used guns for sale or auction, you might find The Judge pistol, which shoots both 45 Colt and 410 shot. Others, like 357 Magnum revolvers, shoot 38 Special as a happy coincidence. When looking for versatility, you should know which firearms shoot multiple calibers.