4350 with Barnes 250 grain originals, but keep in mind when you AI the 348 case, it is a BIG step up in case capacity. Non AI'ed 348's should still get to about 2300 or so with that powder. The 348 is definately one of the better cases for the AI treatment as far as bang for the buck. Loads were checked by me with my chrony but were develpoed by Bob Hagel and published in Guns and Ammo magazine.
Thanks!
-R44
