I mean I'd like an AAA Slayer but regged. Really a carbon bottle, or two carbon bottles, would be better than their tube too. (lighter and greater volume) Of course no such beast exists..... Allegedly they're 1MOA guns, but with a 7 round count and no regulator how many rounds actually go into that 1MOA group is a bit questionable. *shrug*
Honestly, for range time, you might not want a big bore at all. The air consumption is massive, and the bullets are comparatively pricey, so its all to what end? If you're just looking to punch paper at longer range, you might want to consider a .22 slug gun. Better air efficiency, and still has pretty good legs.
Just my rambling thoughts on the subject. No offense intended to anyone or any particular brand, nor any particular big bore expertise to lean on.