Just had an '06 AI rebored to 338/06 AI (done by the outstanding J.E.S.) The weather here in mid Willamette Valley is so abysmal I've just not been enthused to get out to shoot yet, but soon I will - There is seldom any "velocity" reason for an AI chamber (although I've had outstanding results with a number of 223 AI's and my .280 AI is beloved) I keep reading these "fireforming is a PIA and not worth the trouble" comments, I could not begin to count the PD's I've "off'd" with fireform loads from 223 AI's, accurate, fast and brass ready to go afterwards - Fireform loads for others, like the 338/06 AI, are no big deal to form and with a bigger bore I like the bit of a shoulder increase for HS'ing - Shot 338 Win Mag forever, great cartridge but the 333/06 is more efficient and kicks less AND more efficiency from a 22" barrel (which I really prefer) First try for loads will be with 200 gr etips, will try 225 TSX if the 200's don't pan out