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Thanks for your helpful hints, gentlemen.
I think my bit wasn't quite up to the task and was running too hot too quickly.

Any more suggestions?

I'm not familiar with firearms or propellant smell, but the wedge on this one was white (before) and was emitting a dark black smoke and had a biting smell, not unlike one of those pine scented...

Damn, I had a weird experience, this afternoon.
I wanted to practice removing scales, so I grabbed an old flea market razor that was the designated victim for this exercise. Don't have a drill...