On most calibers you can use the LCD (Lee Collet Die) for the parent round on the true Ackley version of the same round. I personally use my 243 Win LCD on my 243AI rounds and it works great. I know 22-250, 243, 260, 7-08 and 25-06 all work that way fine. I see no reason why the 30-06 to 30-06AI wouldn't work. As far as using the 7-08 LCD to size 284 I don't have my books in front of me but I am going to bet that unless the base to should length is close, it won't work without modification (which isn't too hard). I know that Lee will make you a custom LCD and a Dead-Length Seating die for about $60, all then need is 3 fired cases and a bullet of your choice.
What caliber exactly did you want to get in Ackley? Some rounds are not worth the effort and some get very substantial gains. The one thing I will say is using an A.I. chamber basically eliminates the need to trim.
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