Joe Chicago
If I can, I cut at 90 degrees to the bore. I like to use a TPG-320 in case if its chrome lined.
Other than that Go to brownells and get a 11 degree which is really a 79 degree Facing cutter and pilot.
When using the Facing cutter I like to place a lock ring around the cutter. This will stop any tool chatter at the end point.
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