I dont mean to bust any balls it's just that unless you're a breeder of hundreds of snakes, how hard is it to place a feeder on a $20-$70 scale? You're already writing down fed SR (which is already the least amount of effort for identifying a small rat btw). A small rat ranges from what 40-80 grams? That's a pretty big variance. It's nothing to worry about but if you are closely monitoring the snake after an illness, Wanna keep neat paperwork to see growth rate, compare to your other snakes... I only have 2 ball pythons but i know i can feed both a small rat every 7 days but one snake could be getting a 40g and the other 80g for their meals. Then you have people starting a thread asking 'why is mr wiggles so much bigger than ms curls?'. You accuse slim of giving confusing information while youre doing exactly that. Not everyone can just eyeball an appropriate feeder, so the 10-15% rule is pretty fail safe and great for new owners to follow.