I prefer spiral point or tip "gun" taps. They are intended to be used only for through hole tapping but I have been able to reverse them successfully and I drill the blind hole much deeper than I need to tap it in order to accomodate the string like chips that are forced ahead of the tap by it's design.
Busy Bee 12-36 lathe, Busy Bee Mill drill, Busy Bee 4x6 bandsaw, Homemade 9x17 bandsaw, Ad infinitum.