I found this thread entitled "post your biggest bloods" on bloodpythons.com:
http://www.bloodpythons.com/forums/s...hlight=largest
The largest one mentioned on that thread was 7', with most of the ones mentioned falling between 6' - 6.5'.
Also, according to NERD's blood care sheet "Females average 4'- 6', males average 3' - 5' adult size. Maximum reported size is around 10 feet, although 8'+ specimens are considered EXTREMELY large."
According to VPI: "Most adult females measure 50"-66" in total length, most adult males measure 40"-56" in total length. Older females occasionally attain 72" in total length. The maximum size for the taxon reportedly exceeds 9 feet in total length, but we are unconvinced."