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I'm no expert by any means, but a quick google search says:
"The horn itself forms as a hollow cone-shaped sheath around the bone"
Presumably, the tip end could have a hollow, and the bottom would be solid.
Maybe someone who really knows will chime in.
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Horn is solid towards the tip however depending on the length of the horn it is usually only solid for a few inches. I worked some Buffalo(American Bison) horn once that was solid for about 4 inches. buying raw horn though is alot of work usually it comes very rough and takes a lot of sanding to get to a smooth state for polishing. When I made powder horns I always tried to buy some that were already pre sanded to a smooth state to make it easier on me and less smelly too. Hope this helps you out? If you want the whole horn you can do a search for reenacters supplies and you should find some. I can not remember some of the places I ordered from for the life of me though sorry. Try this place they have some stuff http://www.crazycrow.com/Merchant2/m...de=800-300-000