My only question is whether the Dreamline guns have adequate power for .30 cal. Without add-ons or modifications.
FX doesn't show muzzle velocity for the .30 on their web site last time I looked ("TBA"). Utah Airguns shows a 'Tuned Velocity' of 820-840 fps using the 44.75's. And, for example, FX shows the Crown Mk II in .30 cal with a muzzle velocity of 870 fps (assuming the 44.75 as the calculated muzzle energy (75) works out with that pellet at that muzzle velocity).
My FX Boss shoots the same JSB pellet at 873 fps, while my Uragan King shoots it at 935 fps, both guns un-adjusted from their factory tune.
Perhaps actual owners of Dreamline .30 cal guns will chime in, but from the numbers it seems like it might be under-powered for .30 cal (or at least not high power). But also, perhaps this is something which might be easily and inexpensively addressed with the addition of a simple FX power plenum?