my 05's - 2000g+
my 06's - ranging from 500-1200g
my 07's - one as little as 200g (picky eater), and one about to round the 800g mark (ravenous pig).

You'll have your basic rules of thumb for what a bp will weigh at a certain point in it's life, (unless its been severely neglected) but alot of it just depends on the individual snake and its eating habits.

Hope that helps!