I recon the "beware the man with one gun" statement has got a real swing, so why not buy a gun where there are readily available barrels you can chop in or out until you find your preference of caliber. A hw90/98/95/80/85 is a great place to start I recon.
This way you can keep exactly the rifle you know with the scope you know and really see the difference that the caliber makes, without huge cost or any real loss in skill when swapping....,
I'd also like to add that falcon acc+ in .22 are 13.43grns.. only 2grns heavier than 11.4grn ftt's. That isn't a huge difference by all accounts......
Learn your caliber its all that matters really.