I am trying to bore out a red brass pipe from 3/8" to 10mm using my drill press and a standard twist HSS bit. Running the drill at 600rpm I can't get more than half an inch in before the drill starts binding. I tried running first with cutting oil, and then, thinking maybe the oil wasn't sticky/viscous enough, tried with Permatex silver, which only got me a few mm further before binding.
My guess is that I need some sort of metal-cutting bit that has a narrower shank so that there isn't friction except where it's actively cutting. If so, what are such bits known as?
Is there any other practice I might be missing to make this work?