A:
My youngest daughter uses a 25# Parker SideKick and the G5 Small Game Head to thump bunnies and squirrels and gophers. They fly several feet down range (depending upon size and weight) and they don't get up.
On larger game that is a bit more stout (armadillo possum, etc.) we'll fletch w/ 4" right wing feathers in right helical and they tear a 1" diameter hole several inches deep through anything.
They are as insidious as they look.