I have had a couple of 6mm's on short actions and they work great. Not sure where the idea comes from that a long or medium action is needed. A 6mm AI would be a great fit as would a 6mm/284 which I have had some play time with and really enjoyed. You do get meaningful performance upgrades going to either of the three and I agree completely that having something different is a lot of fun.

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About 2016 team "R" candidates "We definitely need a crew with a sack of balls the size of hot water bottles, bloviated estrogen leaking feel-gooders need not apply." Gunner 500