I take a sized case, measure the outside neck diameter, seat a bullet and measure outside neck diameter again. I take the measurement taken without the bullet seated and subtract from the measurement with the bullet seated. Two to three thousandths difference is my goal the same as everyone else I have ever talked to.
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Measure case neck ID while it is in the bushing, then again when out. Memorize the difference.
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how do you measure the case when it is in the die ? Why measure inside neck diameter anyway? you get the same result outside neck measurements