I don't go by weights for any of my snakes and BPs are the first species I've seen in my 20 years with feeding charts and gram feeder size guides.
I keep bps, boas, corns as well as some other species.
I base food on the size of the feeder and size of the snake. I do not feed anything larger around than the thickest part of the body for majority of species.
if your boa is feeding on small adult mice, you can either keep going to large mice or switch over to a similar size rat, either is fine.
A small adult mouse would be about the same size as a rat fuzzy or possibly small rat pup.
For many snakes, feeding frequency will have a larger impact than feeder size. With most snakes, slower spaced out feedings of appropriate sized prey is best IMO
Your mileage may vary and there's no set 'one way is the right way'.
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