Handguns and handgun ammunition come in many different sizes. For new or prospective gun owners, it can be intimidating trying to sort through all of the information that’s available. Asking other gun owners can be a good resource, but be wary. Most experienced gun owners have built-in biases for or against certain calibers.
So here is a list of the most common handgun ammunition (both pistol and revolver), listed from smallest to largest. Please understand that this is not an all-inclusive list, but just the most common calibers for modern handguns.