To avoid going against, or disputing, what Todd said about average lengths & weights, let me put it this way. And I do so with all due respect to Todd, and/or anyone else.
Based purely on photos and posts from this forum and on various other forums, and from what I know some people have, here is what I have seen, read, and/or heard of:
Males - Average length of 11 - 12ft, 80-plus pounds.
Females - Average length of 14 - 16ft (closer to 14), 100-plus pounds.
Now, with that said, there may be some people whose average Burmese python may exceed those ranges. Zoos and rescues could fall into this category. Unfortunately, there aren't a whole lot of long-term keepers. I used to wheel & deal a lot, myself, to get a different morph or species in trade and gaining experience. Breeders will usually retire & get rid of their older, larger ones because it's just not cost efficient to keep 'em. But a lot of people ditch theirs once they get 10 - 12 ft and the novelty wears off and the reality of the cost of feeding & caging hits home.
I feel that the length to weight ratio Todd posted (for males and/or females) is "ideal." Unfortunately, too many people are overfeeding these days and there are a lot of obese Burmese pythons. A 14ft, 100-pound Burmese python is a very healthy specimen. Add a few more pounds at the same length and you'll have an obese one.
So where do all the big ones go? Where are they? I'm afraid we wouldn't like to know the truth. No tellin' how many "giants" have perished due to poor husbandry. Either in the hands of inexperienced keepers or lacksodasical ones.
Take care!
HH
-----
Due to political correctness run amuck,
this ol' hillbilly is now referred to as an:
Appalachian American

www.natures-signature.com