Correct. If your snake weighs 150 grams, the rat/mouse should be around 22-23 grams (give or take...this just gets you to the right sized prey item in terms of fuzzy, pup, weaned, etc). If you're feeding mice, this would be a large mouse. If you're feeding rats, this would be a rat pup. If you get feeders at a pet store like PetSmart, look at the total weight and divide by the number of mice/rats in the box to get the average. If you order your frozen feeders online, double check their weights but they should be pretty close to the chart above. No need to weigh the prey each time. I weigh my snakes the day before feeding as this is normally when they are "empty".
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