Yes some of my balls are 3000 + grams and they do just fine on rats that size. Every thing from 1000 grams and up gets a small rat every 7 days. 950 grams and below get just weaned rats every 5 days till they hit 1000 grams.
When you've got 10,000 people trying to do the same thing, why would you want to be number 10,001? ~ Mark Cuban