RI Popper, I don't do that many, at most 10 at a time. I'm sure that the spade bit is the way to go, but I think I grind them down incorrectly.
"SAFETY is the most important thing, Don't try free handing these things use a jig. We have a lot of time and a lot of wood but a limited amount of skin."
RI you are right about safety ... I do use a jig...no more free handing, learned that the hard way
Thanks
Chris