There is a world of difference between SELLING ammo (made by someone else) and LOADING (or reloading/ remanufacturing) ammo.
If you plan to reload for commercial purposes, you will need a FFL as a Type 7 FFL ($30/ 3 yrs) and pay a Federal Excise Tax on what you manufacture. You will also need to be licensed under ITAR, and pay a fee of not less than $2,250/ yr. You will also need a business license.
I would STRONGLY urge you to incorporate, and get Products Liability insurance.
What we have here is... failure- to communicate.