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RE: 40-65: Learning what I can
That's a 4 degree.
Freebore is a cylinder of what ever length and it is usually deeper then the groove by a couple thousands. I had a Pedersoli that had a .450" long freebore.
The funnel transition extends from the chamber wall to the bottom of the groove
The reason a dog has so many friends is because he wags his tail instead of his tongue.