I'm sure Evenstar or Daybreaker will chime in, but on my two babies I feed sub adult mice(basically the smallest considered adults). My male is about 120g and takes roughly 15-16g mice and my female is about 155g and she takes about 18-20g mice.
The "general" rule of thumb is that the prey item shouldn't leave a noticeable lump in their belly. I personally like to feed large enough that you can tell they ate, but not so large as to cause any real "lump" and def not any stretched scales.
Even my 2007 8-1/4' BCI only takes small-medium rabbits. And I feed rabbits because I feed live, and as a personal choice I like a prey item that doesn't put up a real biting match with my snake. The rabbits just chill there and don't bite, while rats will bite before the snake even strikes.
Edit: whoops didn't see Daybreaker already posted lol.
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