I'd agree with Luke on this. Years ago I had a FAC rated Falcon FN19. superbly accurate to about 60 yds. I stupidly sold it because I thought the rimfire was a better option and I had problems with re-fills on the Falcon.
The rimfire, whilst quiet compared to an unmoderated .22 or a centre fire, is loud compared to a FAC air rifle.
I am seriously considering going back to this option as the ground I shoot on now has a lot of flints and I am very concerned about ricochets with the rimfire.
Sib