First problem would be that yellow brass melts @ 1710 degrees F. IF you have access to some type of furnace capable of that temp, and well above, then possibly.
Now for the mold. I doubt even an iron or steel mold will withstand those kind of temps. Aluminum most certainly would not, neither would brass molds. The sprue would also be very difficult to cut.
Most brass casting is done in sand molds. They're not very accurate, and finishing would be a requirement.
Most important question is WHY?
The more people I meet, the more I love my dog
They're going to get their butts kicked over there this election. How come people can't spell and use words correctly?