In my experience, fairly extensive, I find they don't kill a house sparrow reliably past 15 feet. No way I would take on Pigeons with them.Maybe I missed it but I haven't seen anyone mention .22 shot shells. Their range is limited but they work great on birds and no stray bullets. Set a feeder up close to a window. No one will even see you.
Yep, they are called wrist rockets.They do make those whisper pellet guns now.