One my my male ball pythons last clocked in at about 1500 grams, and he's been eating a small rat every week so it may be more now--he's too big to fit on the scale anymore....Urgh.
My other boy who hasn't eaten in a few weeks now weighs, I'd guess, around 1300 or more, I'll have to tip him onto the scale soon and find out. (He curls up in a nice ball so I can actually get him on the scale, haha)
Both are almost 2 years old at least.