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Rifles, Reloading, Optics, Equipment
Gunsmithing
Chamber Neck Diameter
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<blockquote data-quote="J E Custom" data-source="post: 1761479" data-attributes="member: 2736"><p>Chambers have the neck part of the chamber tapered for extraction advantages. The cartridge case will be straight when sized and while loaded for uniform grip/tension on the bullet. Only when fired will the cartridge take on this .001 thousandths taper. the fact that it only occurs when the case has been fired has no effect on accuracy or anything because the neck will be .003 or .004 larger than the bullet after firing.</p><p></p><p>Just like un-fired brass, turned brass will not have a taper until it is fired in the chamber. Even straight sided cases (Like the 45/70 and others) have a slight taper on the outside for extraction. If the neck was perfectly straight, potentially it could be mechanically bound up if debris was left in the chamber from previous firings but the .001 thousandths taper all but eliminates this phenomena. </p><p></p><p>The reamer has this same amount of taper in it in order to cut the chamber the same as the Spec. As Shortgrass said "No Problem"</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1761479, member: 2736"] Chambers have the neck part of the chamber tapered for extraction advantages. The cartridge case will be straight when sized and while loaded for uniform grip/tension on the bullet. Only when fired will the cartridge take on this .001 thousandths taper. the fact that it only occurs when the case has been fired has no effect on accuracy or anything because the neck will be .003 or .004 larger than the bullet after firing. Just like un-fired brass, turned brass will not have a taper until it is fired in the chamber. Even straight sided cases (Like the 45/70 and others) have a slight taper on the outside for extraction. If the neck was perfectly straight, potentially it could be mechanically bound up if debris was left in the chamber from previous firings but the .001 thousandths taper all but eliminates this phenomena. The reamer has this same amount of taper in it in order to cut the chamber the same as the Spec. As Shortgrass said "No Problem" J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Chamber Neck Diameter
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