Having done both, in short action, I would go with 260AI.
What did you have to do to get it to feed? Terry Cross says a 260ai needs a centerfeed mag, so there goes any weight savings over an ADL long action
He needs to find a new gunsmith. They feed, not as slickly as the parent case, but feed pretty good. As yes, I know who he is. He only says that it isn't "reliable enough for a sniper rifle".
