Boa constrictor belly lump size

I am trying my boa on large weiner rats instead of small and there is a noticeable lump after feeding. There isn't one when I feed her on small weiner. Will she be on large from now on?

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As long as the lump isn't overly dramatic and you don't handle it for three days after it eats your snake should be fine. I would extend the time between feedings; for instance if your boa was on a ten day schedule then push the feedings out to every two weeks.

Why are you going from small to large weaned rats? If the smalls leave barely or a small lump, then there is no need to upsize yet.

If you are doing it because that is all that is available atm, then a larger than normal prey here and there wont hurt them but like bcr said, if you are feeding a larger prey, extend the next feeding out in proportion to the size upgrade.