I've never seen a 6' BP. I've had Dottie grab my index finger up to just below the 2nd knuckle and try and drag my finger/hand into her hide to eat it lol. It was the only bite I had that actually hurt because all the other bites from everyone else were quick tags so you don't even feel them, just some blood. For Dotties bite I had to use my free hand to pick her up and dunk her head with my finger still in her mouth into her water bowl. Once her head was submerged, she let go and then looked at me , adjusted her jaw and crawled into her warm hide lol. This was a feeding error on my part as she was eating one rat and I figured I could reach in real quick and grab a piece of big aspen off her lip before she could finish swallowing. Yeah I know, stupid idea but it was only a 4.5' snake so I wasn't too worried.
A big one tagging you will mean bigger teeth and yes more pain. It's like put a bunch of thumb tacks through a piece of cardboard and then whack the top of your hand with the cardboard. That would probably be what it would feel like lol.