I make my tampers out of Ebony without power tools.
It has a
Janka Rating of 3220 owing to the high silicate content of the wood.
It is very hard to burn and IMHO makes the perfect wood for tampers.
It will dull your tools in no time at all.
This one took about 3 days plus polishing.
If anyone wants me to create one for them, send me a PM.