I've had great results with stability on sheephorn scales by glueing a liner to the scale before fixing it to the knife. I started doing this for tow reasons. One was the stability and two I'd often be able to see through the sheephorn when it was polished, it'd go translucent on me and you could see the tang. This has led to some really cool results where the sheephorn glows with the color of the liner, green being the color that influences the sheephorn the most for some reason that I don't understand.
Yes I do trade for horn, mostly elk sheds although I used to trade quite a bit for different sheep and goat horns. There was an animal dealer here in town. He'd buy a hundred goats or sheep here for $$ and sell them there a week later there for $$$. He was an auctioneer at many of these sales and he knew what was a deal and what wasn't and where they might bring more. If one died while he had it, his guys would cut the head off and toss it on the barn roof to season. That dried up though (sorry for the pun) after a couple of years as he switched to cattle only. I do remember though dropping his son off before he was old enough to drive. We'd pick up Easton and he'd come to the ranch and cowboy for us. He was great help. We'd pick him and his horse and a few dogs up and then drop him off at the end of the day. Was dropping Easton off one time and we had to wait as there were literally about 500 goats being driven from one field on one side of the drive to another on the other.. I was thinking knife handles the whole time. They were also some long haired variety and I was seeing wooly chaps too!
I have had some sheep horns lately and haven't got much yield from them. Most of the times these days I buy sheephorn scales. Do trade for elk sheds though. A lot. Any natural material seems to benefit from sitting around some before use. I've got some walnut scales that were cut in 1959. Same year I was. They're pretty stable. Some rosewood too my dad brought back from India at the end of WW2 Its pretty stable too.
Some of that rosewood:
Some recent sheephorn. This knife made as part of the trade for the horn:
Some traded elk:
Elk and store bought sheephorn. The sheephorn has black liners. The black seems to intensify the natural color of the sheephorn:
Green liners tinting this sheephorn slightly green:
And a lot green on the other side: