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Rifles, Reloading, Optics, Equipment
Gunsmithing
Choosing Throat Angle for 338-06 Improved
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<blockquote data-quote="Bullet bumper" data-source="post: 661754" data-attributes="member: 17844"><p>The exact angle depends on the freebore diameter which could vary from .338 to .340 in some cases. </p><p>At 338 x .189 x .330 = 1.2124 degrees , half angle .</p><p>At .340 x .189 x .330 = 1.5154 degrees , half angle. </p><p>It changes significantly with just a small change in freebore diameter .</p><p>I would be surprised if the chamber freebore diameter is right on .338 . They usually have some slight bullet clearance but not always .</p><p>How much freebore you need depends on the shape of the bullet you are using and how much you want to seat it in or out of the neck of the case.</p><p>I would make up a dummy bullet with the bullet you want , seated where you want and take measurments from that . Also you need to know what diameter the freebore if any is . The bore will be close to .330 but that may vary also.</p><p>With the exact diameter of freebore and bore and the length of the throat an exact throat angle can be calculated. If you play around with a few different bullets you may be able to settle on a good compromise length that allows seating of several ogive shapes on the lands that you may use by just seating more or less into the case neck . The limitation is usually the limited shank length of long ogive boat taill bullets .</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 661754, member: 17844"] The exact angle depends on the freebore diameter which could vary from .338 to .340 in some cases. At 338 x .189 x .330 = 1.2124 degrees , half angle . At .340 x .189 x .330 = 1.5154 degrees , half angle. It changes significantly with just a small change in freebore diameter . I would be surprised if the chamber freebore diameter is right on .338 . They usually have some slight bullet clearance but not always . How much freebore you need depends on the shape of the bullet you are using and how much you want to seat it in or out of the neck of the case. I would make up a dummy bullet with the bullet you want , seated where you want and take measurments from that . Also you need to know what diameter the freebore if any is . The bore will be close to .330 but that may vary also. With the exact diameter of freebore and bore and the length of the throat an exact throat angle can be calculated. If you play around with a few different bullets you may be able to settle on a good compromise length that allows seating of several ogive shapes on the lands that you may use by just seating more or less into the case neck . The limitation is usually the limited shank length of long ogive boat taill bullets . [/QUOTE]
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Choosing Throat Angle for 338-06 Improved
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