I looked around for an answer to this and I have not found anything. Most people say small to medium rat every 1-2 weeks, but provide no details on the weight of the snake or the rat. Rat sizes can vary depending on the supplier, and of course snake weights vary too.

I have a female that I do not intend to breed. Her last weigh in (Oct 20th) put her at 1236g. She's not quite 4' and will probably grow some more over time, but at 18mo in age, she's nearing adult stage, if she isn't already there.

I know of the 10-15% rule for a growing snakes. Is there a similar rule for adults?

She is somewhat of a mouser. I have gotten her to eat rat, but that was after a month of offering nothing but rat. She prefers mice though. She'll perk up at the smell of mice when I have them out for the other species in the room. During the transition stage, I would offer her a rat, and she would ignore it, but then I could put in a mouse (even a fuzzy!) and she'd strike and gulp it down. At this point I don't care what she eats, but I would like to know a proper weight and frequency. I feel if I went to only mice she would eat herself sick.