Bopping is hard on the bopper (as opposed to than the boppee). I have to have strong wrists, a good grip, reasonable coordination, and strong nerves. The thing I hate about it is the second or so when the rabbit is first upside down--they are scared, and sometimes they squeal, before I bop them.
They never squeal after I have bopped them, which I count as an advantage, since I am in town. I think if I handled the baby rabbits more it would make them less scared, but I wish I knew a way that was as effective of a lights out without using a gun.
I keep considering the wringer, I have heard that sometimes they are too big for the rabbit and he slips out? I like foolproof. My husband's solution to anything is "hit it with a hammer", and that has been my plan, too. (well, I don't use a HAMMER, but you know what I mean) If I have any doubt at all, I don't have to re-load, or look for a plan b, I just bonk them again. Immediately.