In simple terms you are correct. What you are doing in essence is "fireforming" the std. 280 cases to AI. Which by the way you would have to do to get AI cases anyway. Unless, as some others have stated,you can buy brass already formed AI. What you would want to avoid is trying to resize the "fireformed" brass with a STD 280 resizer. You should really considered reloading for yourself. I don't recommend letting someone else reload for you. It is a good idea to get your friend to show you how it is done and give you some pointers but I wouldn't just let him do it for you completely. I always cringe when I hear folks mention this.

Reloading is relatively simple. Its a good hobby, and it opens upoppurtunities that the folks who are confined to factory ammunition cant explore. There are a lot of cool cartridges that you have to reload for if you want to shoot them.

All that being said, my favorite cartridge is the plain ole 280 rem. I've considered the AI a few times but opted to go other ways because I already have the std 280 in my vault."Ole betsy" has been up the mountain and back with me, both figuratively and conceptually speaking.