Dont know what a 'AI' magazine is. I am loading my 208's at 2.975" which fit in the Wyatt magazine. The only way to get them this length and keep the speed is to run VV N550.
Accuracy International mags. I'm guessing no they are max of 2.810". Although there are Morta mags that allow 2.965". I'm kind of wondering about the 190 bergers???