You did not state which A.I you have, so your mileage may vary. I have an AXSR. When I tried using my 338 Lapua magazine for 300PRC, it nosedives into front of magazine, but chambers the 338 Lapua fine. So we know 300PRC will not work in 338 Lapua magazine.
Why did i try it? Out of desperation because the 300PRC also nosedives into the factory A.I 300WM magazine, even though A.I recommends using 300WM magazine for the 300PRC.
I had to send my A.I 300WM magazine off to be worked on and tuned for 300PRC. Now works perfectly for 300PRC and 300WM…