Drill it undersize and end mill it in to size. That size I would def. use an insert drill. A good insert drill will hold the size but it may not give you a good finish and may leave a good sized burr. I've always had good luck with Seco and Ingersoll drills. Don't worry about the throught spindle coolant. I've run many many of these drills with regular coolant at regular pressure.
Wonder what we did before we had 2000psi thru spindle coolant?
:cheers:
I don't know much about anything but I know a little about everything....