I dont weigh at all. I feed a prey item slightly larger than their fattest part. Some weeks they may get a bit smaller and some weeks they may get a bit bigger. For my bigger girls they dont get rats bigger than 100ish grams. Thats the biggest rat i will offer to them weekly. They dont need more than that.
Look at your snake and offer it a rat thats about the same size or slightly larger than its fattest part of its body. Dont get caught up in all the 10-15% thing. It doenst need to be that technical imo.
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