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Rifles, Reloading, Optics, Equipment
Gunsmithing
Big jump
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<blockquote data-quote="Edd" data-source="post: 1451652" data-attributes="member: 30592"><p>The SAAMI throat of a 300 WSM is tapered at 1.5° and doesn't have any straight cut freebore. This type of throat is not uncommon in Winchester cartridges. </p><p></p><p>The .189 length you are looking at, on the SAAMI drawing, is the distance it takes for a 1.5° tapered hole to go from a diameter of .3099" to .300".</p><p></p><p>The bullet diameter is .308" so the bullet will contact the barrel where the bore diameter is approximately .308". The distance it takes a 1.5° taper to go from a diameter of .3099" to .308" is about .036".</p></blockquote><p></p>
[QUOTE="Edd, post: 1451652, member: 30592"] The SAAMI throat of a 300 WSM is tapered at 1.5° and doesn't have any straight cut freebore. This type of throat is not uncommon in Winchester cartridges. The .189 length you are looking at, on the SAAMI drawing, is the distance it takes for a 1.5° tapered hole to go from a diameter of .3099" to .300". The bullet diameter is .308" so the bullet will contact the barrel where the bore diameter is approximately .308". The distance it takes a 1.5° taper to go from a diameter of .3099" to .308" is about .036". [/QUOTE]
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