Instead of the AI treatment you should just get a 24" barrel chambered in good old regular .270 Win.
Ken Waters, Jack O'Connor and I have all found that the 2 extra inches of barrel increases velocity of the .270 Win by over 100fps with the same load and bullet.
Increasing the case capacity through the AI treatment will show very little gain over standard .270 when shot through a 22" barrel.
I was amazed at the velocities I got from the same loads when I got my LH 700KS with it's 24" barrel.
Quite frankly I don't understand why any mfg would handicap the great .270 Win with a 22" barrel. I'll never own another .270 without a 24" or longer barrel.
Same here. For me it's 24". Was just re-reading as my buddy is going to settle on the plan non-AI 270 Win. and use the slightly longer barrel.
