My BP is around 660 grams. I'm lucky because the pet store near me carries rat pups. I'm not sure if I misread but are you using tongs or hands to feed? If you're using hands, definitely make the switch to tongs. That way you don't get bit by any animals. I would say your BP is definitely ready for small rats. I've been feeding my small rats for a while now. You have to be very careful with them and your BP as they are big enough to inflict some serious damage. You can try stunning the small rat. I've really only heard of one method of doing this and someone else with a lot more experience than I will be able to help you a bit more but you basically put the rat in a bag and either bop it on the head or smack it against the wall in a bag. Stunned rats can be dangerous as well without supervision. If they wake up chances are they're going to be scared and I would assume more likely to attack. I hope this helps.