I think it can go as high as 60, I'm not certain though. It's really easy to adjust, we do it right there at the range when I'm too tired or feeling B.A. Once you get over the hump and it lets off, a six year old could stand there and hold it all day. It's a really manageable size too. It looks like a toy, but I assure you it's not.
I've never had rabbit that I know of, but I've always wanted to try it.