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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Throat testing
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<blockquote data-quote="rammac" data-source="post: 2012230" data-attributes="member: 27761"><p>In Harold R. Vaughn's book "Rifle Accuracy Facts", he talks briefly about chambers and throats in chapter 3. Basically he says that any throat half angle of less than 0.75 degrees would increase the chances of stripping the bullet (removing material from the outside surface of the bullet). He states;</p><p></p><p></p><p></p><p>So obviously the optimum throat angle would depend on the bullet shape and length.</p><p></p><p>I don't remember if he talks about diametrical clearance between the bullet and the throat but he does talk about neck and chamber clearance, which I'd assume that he wouldn't want any more bullet/throat clearance than whatever the neck/chamber space is. He says that military grade rifles have about 5 mils of neck/chamber clearance and he expects a 6mm bench gun to have only 0.4 to 0.7 mils of clearance.</p><p></p><p>As for throat length, I only saw where he talks about throats being non-concentric with the bore axis. He says that an error that creates an offset of the throat length of 0.18 inches is unacceptable for a precision cut barrel.</p><p></p><p>He may mention these features to a greater extent in his book but it's been a while since I read it and I don't have to time reread it now but hopefully this sheds some light on your questions.</p></blockquote><p></p>
[QUOTE="rammac, post: 2012230, member: 27761"] In Harold R. Vaughn's book "Rifle Accuracy Facts", he talks briefly about chambers and throats in chapter 3. Basically he says that any throat half angle of less than 0.75 degrees would increase the chances of stripping the bullet (removing material from the outside surface of the bullet). He states; So obviously the optimum throat angle would depend on the bullet shape and length. I don't remember if he talks about diametrical clearance between the bullet and the throat but he does talk about neck and chamber clearance, which I'd assume that he wouldn't want any more bullet/throat clearance than whatever the neck/chamber space is. He says that military grade rifles have about 5 mils of neck/chamber clearance and he expects a 6mm bench gun to have only 0.4 to 0.7 mils of clearance. As for throat length, I only saw where he talks about throats being non-concentric with the bore axis. He says that an error that creates an offset of the throat length of 0.18 inches is unacceptable for a precision cut barrel. He may mention these features to a greater extent in his book but it's been a while since I read it and I don't have to time reread it now but hopefully this sheds some light on your questions. [/QUOTE]
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