Determining proper prey size...

[RobNJ]

He said that when choosing you want to feed nothing with a skull wider that the snake's jaw. I found this interesting. Both weight and width seem to be hard way to go because your snake could be either a) overweight or b) underweight and this could lead to an improper prey size. What do you think about this?

I think it would be pretty much the same as feeding based on the girth of the snake.

But that's also why I would stop at 100g prey item due to obesity in adults but there are signs of a obese snake.

Ball pythons are capable of eating rats far larger than 100 grams regularly without ever become obese.