Doves - anything including .177. Aim well, head shots if its safe as they are very good to eat.
Crows - I'm sure either .22 or .25 would be fine but for safety at 20-30 yards I would use a .22 wadcutters or maybe an RWS Superdome. The wadcutters really lose steam quickly, and the Superdomes aren't that much better. Meaning that they slow down enough to be safe a lot sooner than many hunting pellets. Crow Magnum pellets likely have the same low BC as the Superdomes.
