The aircraft stuff that has nickel in it machines a lot like some
stainless.

Squeaka squeaka............

Work hardens if you arent careful too, IIRC

Almost like some tool steels in that respect. Take a chip, don't let the
cutter rub or the stuff hardens
up like you won't believe. I was countersinking some wear blocks for 1/4"
flat head socket screws.
Single flute 82 degree TiN coated countersink, decent drill press, low
speed. Let up on the pressure
for about one revolution. Had to finish that one with a carbide burr in a
die grinder!

Bill