3000 grams is pretty big for a bp. And there are like 456 grams in a pound. A good female should weigh 3.5 pounds like Damien said, if not more. But you also have to factor in length. Bp's range from 3-5 feet on a typical basis. 3 feet tending to be small males, 5 being large females. Females tend to be thicker and heavier. Sex and length are massive factors.