What brass should I use to form 6mm AI cases, and what kind of experiences have you had with each brand? I am not interested in using Norma 7x57 brass.

I shoot a 7x57AI and use both Rem and W-W brass with good results. The only real difference is W-W brass has just a little more capacity than the Rem's, but other than that, both are usable for forming AI cases.

I've got two 6RemAI one I use Rem other Win brass and both work fine. I found some new Rem 6Rem nickel cases afew years ago and use those in my first 6AI and they formed great got about 6 reloads on that brass wish I could find some more. Well good luck