I don't live far from Don and have had just the opposite experience--I refuse to hunt rabbits with a Judo anymore. My preferance is a broadhead--sharp or dull, cottontails or swampers.
Any shot tight behind the shoulder and up (shoulder, neck, head) has always been DRT (Dead Right There) for me, with a broadhead at least.
Quickest kill I ever saw on a rabbit was a tight behind the shoulder shot--took out the lungs and heart, rabbit literally fell in it's tracks (it was sitting still at the shot).
They can be tough buggers, but lots of fun to hunt. Using a shotgun or a .22 doesn't mean you won't loose one here and there.