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Rifles, Reloading, Optics, Equipment
Gunsmithing
Calculating Free Bore on 6.5 WSM?
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<blockquote data-quote="Edd" data-source="post: 1793271" data-attributes="member: 30592"><p>I think I can explain where the numbers came from.</p><p></p><p>The bullet diameter is .264" but it is difficult to identify the exact spot where that diameter ends with mechanical measuring tools. It is easier to locate the spot where the diameter is .262".</p><p></p><p>The .0477" is subtracted from the measurement because that is the distance from a diameter of .2645" to .262" at a 1.5° angle.</p><p></p><p>The method has a fallacy. If one wanted to use this method, you would need to know the angle of the bullet nose in addition to the throat angle and you would need to use .264" instead of .2645" in the calculation.</p></blockquote><p></p>
[QUOTE="Edd, post: 1793271, member: 30592"] I think I can explain where the numbers came from. The bullet diameter is .264" but it is difficult to identify the exact spot where that diameter ends with mechanical measuring tools. It is easier to locate the spot where the diameter is .262". The .0477" is subtracted from the measurement because that is the distance from a diameter of .2645" to .262" at a 1.5° angle. The method has a fallacy. If one wanted to use this method, you would need to know the angle of the bullet nose in addition to the throat angle and you would need to use .264" instead of .2645" in the calculation. [/QUOTE]
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Calculating Free Bore on 6.5 WSM?
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