Ian wrote.....If the drill self feeds it breaker its grip with the taper and slips.......
This only happens if the forces are excessive.
The depth of cut on each lip will be less than 8 thou.
The rate of feed is entirely depepndant on how slow you turn the handle.
The flute angle (rake) can be overcome by grinding a flat each lip, as for drilling brass.
This is the way I have done many jobs without the drill pulling out. The last one opening up a hole to 1.25 ".
Reamers are very expensive for a one off job. You could try and get on the Varmit Al's reamer queue, or just buy a 13/64" drill and DIY.
HTH
Ellis
