How are Buffalo horns made into spoons?

Powder Horns are made by cleaning out the inside and sanding down the inside of the horn to make them lighter and translucent (so you can see the amount of powder in it when held up to the light). A hole is drilled from the pointed end into the hollow horn. The large end is plugged and the tip is finished with a removal plug. Buffalo horns are large diameter and heavy. I've seen one that was flattened so it appeared more like a flask. Otherwise, there is no real difference in making a powder horn from a buffalo horn.