My biggest two females this year are in the 3,600 - 4,000 gram range (around 8 - 9 lbs). They are around 7-8 years old (the record for a ball is like 47 years). I'm hoping to get 11-12 eggs out of each. I also have a 7 year old girl that only weighs about 2,000 grams so they don't all get big.

I swear I read some where that VPI had some around 20 lbs. At any rate there are females that have laid clutches in the 15 - 18 egg counts so I know they have to get bigger than mine. If a female laid 18 eggs averaging 120 grams each she would probably weigh about 6,480 grams (14 lbs) if you assume that she laid the usual 1/3 of her pre lay weight. However, it may well be that the very biggest girls lay huge eggs or don't lay the full 1/3.