If you feed one properly sized rodent once a week, your bp should put on weight with no issues. If you could feed him rats (which are larger), he'll put on the weight.
Power feeding can cause too things:
1) am inconsistent eater
2) a fat snake.
Your snake should feel muscular without any scales protruding. There is no rush to get him up to weight.
Also, even if your snake turns out to be a mouser, it's not as big of a deal, assuming it's in fact a male.
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