Re: 239 bore.
To get a close idea of your taper all that is required is square up one of your existing rings in the bottom of the bore and measure the end gap.Do that three times starting at the bottom then half way up and last at the top under the ridge compare your findings as to end gap and you can calculate the taper as the end gap increases with the formula of PI. Every .001" increase in bore will give an increase of .00314" end gap.
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