I experimented with lubing pellets using Frog Lube for my FX Indy .22 (ST barrel, obviously), and found slight (perhaps a measurement error) degradation of precision with lead pellets at 25 yards, and very strong degradation with lead-free pellets.
Then I did some googling and found quite a few posts on other forums where it seems the consensus is against lubing pellets for FX ST barrels (Yrrah had done some research there, I believe).
As soon as I get a bit of time, I'll start another thread describing my findings. For now - I'm out of lubing business.