The numbers are off, because the calculator doesn't account for its natural torpor drain, unless you can fire the listed amount of darts all at the same time, bring at minimum double the recommended amount.
I dare you to raise one!! They are savage if you got two high lvl parents (about lvl 140ish) and you get imprinting on it. The thing will become an adult with about 230% melee and basically one chomp any bronto!!! But on the down side you loose your job and your girlfriend