Re: 25-06AI from '06 Brass
use the intermediate die, maybe even several. You'll likely wind up crushing some case necks/shoulders if you don't. I can certainly appreciate the desire to use Lapua brass, it is truly fine and wonderful stuff. But, as a general rule, you'll almost always have less trouble necking something up, rather than down. In other words, make your 7mm08 out of .243 Win, not .308 if at all possible. In the case of the 25-06, that really isn't an option, but necking things down invites some potential problems that I'd rather avoid.
In the case of some wildcats, or some extreme financial duress (yes, I made a lot of .243 Win out of 7.62x51 when I was in the service!) I'd consider this task carefully before diving in too quickly. There's a lot of factory 25-06 brass out there already . . . Try a box of the Lapua, use intermediate dies (280, 270, 6.5-06 if you can) and see how it works out for you.