First let me sat that I am a FIRM believer in AI's. That said; you already have a very "improved" 338, if you are trying to reduce powder use etc. I think I would stay away from the improved version of the 338-06. EVERY reason stated by the others for doing an AI is dead spot on but against the reasons for building these rifles. If you need better case life, more velocity, and heavier bullets, shoot the RUM.
However, if you do decide to go with the AI version, I will be glad to help fire-form all those rounds with you, heck, if you make good coffee I might even help you load 'em.
Genises 27-3: Now therefore take, I pray thee, thy weapons, thy quiver and thy bow, and go out to the field, and take me some venison...