This could be completely irrelevant...but I was looking at all the pretty coloured corn snakes on the net and found this chart...perhaps it is only good for corn snakes though...
The below chart is a good general guideline to accurately feed your Corn Snake with mice to provide the nutrition it needs. Prey should not be bigger than 1+1
⁄2 the snake's body girth. Each snake is different and you should adjust the snake's meals size, quantity, and the frequency accordingly.
Snake weight Mouse Type Mouse weight Frequency
4–15 g Single Pinky 2–3 g 7 days
16–23 g Double Pinky 2–3 g times two 7 days
23-30 g Double Large Pinky 4-5 times two 7 days
30–40g Small fuzzies 5–7 g 7 days
40–50 g Regular fuzzies 7–9 g 7 days
51–90 g Hoppers 9–12 g 7 days
91–170 g Weaned 14–20 g 7 days
170–400 g Adult 24–30 g 7 to ? days
400g+ Jumbo Adults 40–50 g 7 to ? days
This is the link if you want to see the page:
http://en.wikipedia.org/wiki/Corn_Snake 
