Here is the thread with the feeding chart: https://ball-pythons.net/forums/show...ing-Guidelines
I have found it quite useful.
As others have suggested, I chart everything with our little boy. We weigh him before each meal, record what we feed him (including it's weight), record when we feed, record when he eats, and record when he poops/pees. We also throw in sheds for good measure.
Our 180 gram boy is currently eating f/t rat pups in the 25-30 gram range.
Maybe we'll be less compulsive on our next BP... but I doubt it...