Re: JBM ballistics calculator question
Measure the dia of the barrel below the bell, divide by 2.
Measure the dia of the bell, divide by 2.
Measure the distance from the top of the bell to the top of the barrel and subtract half the dia of the bell from that dim and add half the the dia of the barrel.
That will give you the distance from the center line of the scope to the center line of the bore. Enter that number in your JBM calculator.
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