>>8772159For normal rabbit hunting, use 7 1/2 shot. If you don't care about eating it, use larger shot and get as close as you can.
Understand if you use buckshot, the rabbit might not be struck by a pellet due to its size and the spread of the pattern as it gets larger.
You could blast some rabbits pretty hardcore with high velocity #2 shot, or perhaps lead BB shotshells. Then again, you wouldn't want to eat it at that point.