I believe it holds true all throughout the BPs life. I've never weighed the rats, so I can't be sure, I just go by look. If you put it in and think "there is absolutely no way" then take it out and get smaller. If it looks pretty close to the same thickness as the thickest part of your snake it's fine. It's also better for it to be slightly thicker than the BP than a lot thinner. Just be careful about not going too much thicker, only slightly if it's between that and a much smaller prey!
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