For the MO Ozarks big is 25#'s+. 3yo goes about 20-22# most of the time unless it was a rough winter or late in the season.
Last year I saw the biggest of my life alive and legging it. I guessed him at about 30#. Looked damn near like an ostrich. He was WAY bigger than any tom I've ever saw. Spotted him next to a fence while driving at work and measured it latter. With a high head walk, not alert though, top of his head was 40".