What can the 6mm Super LR do that the 243 AI can't? Which one would you choose? This is intended for hunting not bench rest.
The 6mm Super LR (center) next to a .243 Win. (left) and a 6XC (right). The 6mm Super LR has the case capacity of a .243 Win. but the long neck and 30 degree shoulder angle of a 6XC - it's the best of both worlds!

The 6mm Super LR (center) next to a .243 Win. (left) and a 6XC (right). The 6mm Super LR has the case capacity of a .243 Win. but the long neck and 30 degree shoulder angle of a 6XC - it's the best of both worlds!