It's a helluva hunting round. I can load it down to .30-06, or up to light .338WinMag, and anything in between.
Yeah I believe I saw him shooting it in one of his videos. The ballisticstudies.com website he has is unmatched in my opinion. Talk about someone who has dedicated their enitre life to providing knowledge on one single craft: The taking of game animals and the ballistics around it. It's quite impressive. I did buy his book on long range shooting and it contrasts pretty significantly with the things being taught today. I don't know if you have read it, but it would be interesting to hear your opinion on it. Regardless it is pretty hard to argue with his success on taking so many game animals between 800 and 1200 yards. He's a super nice guy to boot, never met him personally but he is pretty happy to exchange emails back and forth if you have questions.
Edit: He runs the 338-06 A-Square, not the AI