I've been bitten many times by all sizes. Sometimes I can't even feel the small BP bites and wouldn't even know I've been bitten if it wasn't for the little pinprick of blood. The young snakes definitely bite more than the larger ones, but then they think everything is out to eat them.

The worst bite I received from a BP was from a large, semi-aggressive female that I just received. I was taking the temp of her enclosure with a tempgun and I guess she thought the strap looked like a rat tail. She bit and wrapped around my arm thinking she was about to have a large meal. She eventually let go, but not after gnawing on my knuckle for a minute or so. I didn't really notice the pain while she was latched on, but it ached a little for a few days after.

Even with that relatively aggressive bite, I don't think it was as bad as some of the bites I've received playing around with my dog. Snake teeth are very thin and don't do much tissue damage.