Reloading your own ammunition is a way to decrease costs if you are a regular shooter. However, as with any other aspect of a deadly weapon, there are laws that apply to reloading ammunition and reloaded ammunition being used. It's important that, if you're going to be a reloader, that you learn fact from gun law fiction.
In order to buy ammunition reloading equipment you have to be old enough to own the ammunition that you will be making. If you are reloading ammunition for a long gun such as a rifle or a shotgun then you have to be at least 18 years old to buy the necessary equipment. If on the other hand you are reloading ammunition primarily used in a handgun then you have to be at least 21 years old to buy the necessary reloading supplies for your ammunition needs.
Selling ammunition, whether the ammunition is reloaded or it's brand new, requires you to have a permit. These permits are issued by the federal government through the Bureau of Alcohol Tobacco and Firearms, and you have to pass in-depth background checks in order to get a permit to sell ammunition. The exact laws for selling reloaded ammunition vary from one state to another, with some treating it just as regular ammunition, and others making it a separate category, but without a permit you can't sell it, period.
Armour Piercing Bullets
Reloading ammunition isn't illegal, unless by reloading the ammunition you're attempting to turn it into an illegal form of round. For instance, it is a crime to manufacture any round, whether newly minted or reloaded, which is meant to be used specifically to pierce body armour. These rounds go by many names, such as black talons or cop killers, and anyone found manufacturing, transporting, selling, carrying or using these rounds will be subject to the laws regarding armour piercing ammunition.