I shoot the .243 win, had a .243ai, shoot the 6mmai and have a custom rig in 6-284.
I honestly believe the best of these is the 6mmai by a hair over the 243ai, my 6mmai with a 1-12" shoots the 85grn Partition (yeah partition) in the .3 & .4 @ 100yds. Although I am very scared to used it on game @ +3500fps. I have found the 6mmai to be just as easy to load for as the 243ai & WAY easier to load than the 6-284, I fire form with a 80grn Hndy FMJ jammed into the lands with a max load of 4064 (iirc) & it still shoots ~moa which is great for barrel break-in (if you believe in that), plinking etc. Mine is in a Savage 110 short magazine which needed a little mag work, but still easily accepts the longer 6mm.
For pure giggles, grins, shock & awe type stuff the 6-284 w/107 SMK's in the 3200-3400fps area is VERY impressive, albeit HARD on barrels especially when excitement leads to more shooting which leads to HOT barrel
My 243ai with 1-10" LOVED the Sierra 80grn Blitz @ 3450, it is/was an outstanding cartridge, very easy to load, easy on the shoulder & quite flat shooting, alas, the speed but kept biting me & on to the 6mmai & the 6-284 we went.
For your application I would recommend taking a hard look at the 6mmai, right in the middle for speed, ease of loading & still very accurate.