Re: Quoting Kirby but asking everyone.
Like what Kirby said.
When your making a large reconstruction of any case its best to fire form with the cornmeal type process. Lots of bad things can happen when forming with full loads. We had lots of problems way back when....using 300 H-H brass to make a very severe wildcat, cases didnt like the radical form. Now with the 408 cases its about the same thing, you can shoot full loads, but, you may loose some cases along the way and at 2.00 ea. its not fun.
For most other forms, including AI's, just a moderate load will suffice. I have found that the accuracy is still pretty darn good. Only form enough brass for what is needed, you can allways form more along the way if needed to fill out. There is no reason to form 100 rounds of brass for a gun that you will never shoot more than 20 rounds in a sitting. Its ok to have the brass ready to form, but wear on the bbl for just forming sake. This really comes into play with the large overbore rifles where the bbl life is shorter already. 50 rounds of loaded ammo is a great plenty for one of these type rifles, dedicated long range elk rifle and such. My personal 338-408 i only have about 60 formed cases, some were formed with full loads and others the cornmeal method.
In a pinch you can take factory ammo and shoot them in your 280AI, they will shoot just fine.