I vote the 260 AI. I have run several is Savage short actions and when the bullet is seated .025 from the lands there is still plenty of room in the mag. Brass life is excellent and little to no trimming needed. Velocities similar to 6.5-284 with standard 260 powder charges. Gotta love it. Also Remington and Nosler also make 260 brass as well as Lapua.