.243 AI is my favorite. It generally solves the peculiar internal ballistic propensities of the standard .243 and lets me get the original factory claimed velocities for it safely. You get a full 6mm Remington but can take advantage of all the slippery bullets in 6mm with lots more seating depth latitude.
Should mention that I only have two so far, the .243 AI and .250 AI. Wouldn�t mind playing with an 8 twist .22-250AI some day.
Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!
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