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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm WSM long throating
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<blockquote data-quote="Batsin" data-source="post: 3041642" data-attributes="member: 126867"><p>The issue with taking a SAAMI chamber and adding freebore is that the oversized portion of the existing chamber is about .0477" long before the throating tool starts to cut, at least according to the previously linked thread (my brain is to foggy to do the math myself). </p><p>If possible, it would be better to have a reamer that stops after the 45° step-down cone from the case neck (at 2.1100" on the drawing). That way, the tight section of freebore starts a lot sooner. You can see on the drawing that the SAAMI reamer is .287" dia at this point and it takes a fair distance at a 1.5° taper to get down to a "precision" .2845" freebore dia.</p><p></p><p>[ATTACH=full]546481[/ATTACH]</p></blockquote><p></p>
[QUOTE="Batsin, post: 3041642, member: 126867"] The issue with taking a SAAMI chamber and adding freebore is that the oversized portion of the existing chamber is about .0477" long before the throating tool starts to cut, at least according to the previously linked thread (my brain is to foggy to do the math myself). If possible, it would be better to have a reamer that stops after the 45° step-down cone from the case neck (at 2.1100" on the drawing). That way, the tight section of freebore starts a lot sooner. You can see on the drawing that the SAAMI reamer is .287" dia at this point and it takes a fair distance at a 1.5° taper to get down to a "precision" .2845" freebore dia. [ATTACH type="full"]546481[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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7mm WSM long throating
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