Originally Posted by CptRyg
So here is the booboo
It happened on initial contact with the bit kicked back and took a chunk out of the horn.
I had the same happen once, using the same spiral bit setup, etc., starting the cut at the tip of the horn -- since then I always start the cut in a straighter portion of the body contour/downhill grain and haven't had a problem since.
Looks like you should still be good for a sunburst to show off the beautiful grain. :-)