We have a huge problem in South Africa with Rhino's being killed for their ground horn. This is believed to be a cure for any assortment of ailments in the far East.
I hope this user is not just jumping on a money making scheme and in SA an illegal trade. The last vietmanese poacher just got locked up for 20 years.
I have no idea of your required quantity, but a Micro-Plane will work on a small scale.
Sanding methods will make antler dust, but may leave contamination if purity is an issue..
Otis Guillebeau from Auburn, Georgia USA
This came up about six months to a year ago when someone wanted ground deer antler to use as leavening for some special bread recipe. I can't remember if anyone came up with a solution. Otis' sanding suggestion might work if you used one of the carbide Dura-Grit discs. The grit is brazed onto the backing I believe and wouldn't likely come off on something as soft as deer antler.
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