Hey! Well, I believe that the link to the moose antler stuff is in another thread... Um. The one about the German bow built by the Italian man?
Ok, I found it:
Moscow Hide and Fur co. of Moscow Idaho. That is where we order our moose horn from. There is generally little to no pith in it. We order just about 6 inches of the part just above the crown. Pretty solid!
And maybe a simpler bow would be easier, if you would enjoy making that as much as a fancier, more traditional one... and, it's not like you can only make ONE. I think they repealed that law last year.... lol!
If you haven't seen them, I did some photo documentaries of my bow building/learning process. Mistakes and all.... There may be some info in there for you. So long as you don't repeat my mistakes! There are many sets of different kinds of bows as I built them. I will drop you a link if you are interested.
Geezer would usually be on here answering these questions, but he is busy being A Busy and Important Author this weekend! Attending a fun convention. Probably getting home about now and catching up on giving some kitty scritches.
You can also use the Delrin plastic, it comes in the correct size, and it is pretty easy to work. Most of our bows use Delrin for the nut, unless the client specifically asks for a bone nut. They are equally strong. The bone is just prettier.
I never thought of using the bone from a cow joint, but I can't ever remember seeing where there might be a piece of that large enough. And then again, I haven't examined a great many cow bone joints.