The biggest I've shot measured out at 40", but it was a lot fatter than the one you're holding. I always try for a head shot ... too many times I've shot them through the body, and it usually makes several holes if they're coiled up, and tiny little snakes come crawling out the holes. Gives me the creeps.
I'm not a "hating" kinda man ... but I kill the heck outta cottonmouths, copperheads, and rattlers ... without hating them, of course.
Thanks for the pic, Peanut.