I've used BB's in a couple of my revolvers as well as my P23 (PPK look-a-like) they all hit the knockdowns at 10 mtrs.
Pad.E used his P23 in the UBC Co2 comp
Consistantly won wooden spoons so they cant all be bad
Mind you I think he used pellets.
Dont need a sideshoot for em, use em in main comp
Tony