Rat size ?

Alright, so I'm thinking about ordering some frozen rats and I've heard people say that a small rat is about the biggest you should feed a BP. The smalls on Big Cheese say they're between 50 and 89 g and the mediums are between 90 & 150 g. The girl I would be feeding this to is ~1200 g. Should I go with the smalls or mediums?

Mediums once every 2 weeks or smalls once every 7~10 days. That is typically how I handle it. But most people claim you should feed them 10~15% of their body weight weekly. However I tend to underfeed because I'd rather not see them get obese. Although... it is a female and they do get a LOT larger than males... So perhaps you should feed her mediums every 7 to 10 days and get her plumped up a bit so that she gets to be around 15~1800 or more.