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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
284win help
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<blockquote data-quote="Ray Gross" data-source="post: 2698512" data-attributes="member: 95172"><p>There is no freebore. The throat* is all leade. It is actually quite long. An equivelent throat, with a .2845 dia freebore and 1.5 degree leade would have freebore length around .220 +\-. It is hard to know exactly because a bullet will intercept the 47 minute leade differently than it would a 1.5 degree leade. Well, actually you can probably compute it to a few millionths, but when you start throwing in tolerances, it becomes a best guess</p><p></p><p>The standard 284 Win throat is an example of chamber throat design that was very common until the 80's or so. </p><p></p><p>Note how the leade starts at .290 diameter. A throat like that is also suitable for lead bullets that may be slightly over diameter. </p><p></p><p>That doesn't mean it won't shoot well with current bullets, but you will probably have better luck with a throat that includes a cylindrical freebore section to better align and guide the bullet. </p><p></p><p>*the terminology for the various chamber structures is muddy. SAAMI uses differently worded definitions to define the 'Throat' and 'Leade' as the same thing. We use Leade as they define it, a tapered cone. But we use 'throat' as slang for everything between the end of the chamber neck to where the bullet first intercepts the leade. So 'Throat', as we use it, would include the Transition, Freebore and Leade. On the print you attached, I would say the throat is represented by the .233 A2 length. Others may use the word differently.</p></blockquote><p></p>
[QUOTE="Ray Gross, post: 2698512, member: 95172"] There is no freebore. The throat* is all leade. It is actually quite long. An equivelent throat, with a .2845 dia freebore and 1.5 degree leade would have freebore length around .220 +\-. It is hard to know exactly because a bullet will intercept the 47 minute leade differently than it would a 1.5 degree leade. Well, actually you can probably compute it to a few millionths, but when you start throwing in tolerances, it becomes a best guess The standard 284 Win throat is an example of chamber throat design that was very common until the 80's or so. Note how the leade starts at .290 diameter. A throat like that is also suitable for lead bullets that may be slightly over diameter. That doesn't mean it won't shoot well with current bullets, but you will probably have better luck with a throat that includes a cylindrical freebore section to better align and guide the bullet. *the terminology for the various chamber structures is muddy. SAAMI uses differently worded definitions to define the 'Throat' and 'Leade' as the same thing. We use Leade as they define it, a tapered cone. But we use 'throat' as slang for everything between the end of the chamber neck to where the bullet first intercepts the leade. So 'Throat', as we use it, would include the Transition, Freebore and Leade. On the print you attached, I would say the throat is represented by the .233 A2 length. Others may use the word differently. [/QUOTE]
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