I feed according to the individual snake. Some of my girls have voracious appetizers and if I feed them small rats in a few days seem starving and are ready to strike as soon as you open the tub therefore these girls get larger rats. I have other girls that don't like bigger rats and will shy away from them so they get smaller rats. I don't have a ton of BP's (just 20) but out of my say 2009 girls the ones that eat the larger rats are 300-500grams bigger than the ones that eat smaller rats. I have a 4189 gram normal ( I weighed her today) who is a super aggressive feeder and eats every week never missing a meal whom once in awhile I'll feed her a jumbo retired rat breeder and she eats them like nothing.. She had a 13 egg clutch for me last year..