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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Tight neck chamber
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<blockquote data-quote="Varmint Hunter" data-source="post: 32115" data-attributes="member: 313"><p>A tight neck chamber allows you to closely fit your reloaded ammo to the custom chamber. Naturally, in a SAAMMI chamber the neck is quite loose so that all ammo will fit with room to spare. You can not make reloaded ammo larger in the neck to fit better so it is necessary to start with a "tight neck" chamber.</p><p>Brass can then be turned (thinning of the neck wall thickness)to a dimension that will result in ammo that has a neck diameter that is within a few thousandths of the chamber neck diameter. Fitted correctly, brass only expands about .002" upon firing which aids in accuracy and prevents the necks from being over expanded. Cases normally require VERY little resizing. The neck turning operation also provides for very uniform neck wall thickness which also aids in accuracy.</p><p></p><p>I have never seen factory ammo that would fit in the chamber of a tight neck rifle. But I guess one should never say NEVER. Typically, custom barrels with tight neck chambers have the neck diameter engraved into the barrel right next to the cartridge designation, but not always.</p><p></p><p>In my experience, a tight neck chamber is a bad idea for a hunting rifle. All work and no benefit. The only exception would be in a looongrange hunting rifle, particularely where the targets are small varmints.</p><p></p><p>VH</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 32115, member: 313"] A tight neck chamber allows you to closely fit your reloaded ammo to the custom chamber. Naturally, in a SAAMMI chamber the neck is quite loose so that all ammo will fit with room to spare. You can not make reloaded ammo larger in the neck to fit better so it is necessary to start with a "tight neck" chamber. Brass can then be turned (thinning of the neck wall thickness)to a dimension that will result in ammo that has a neck diameter that is within a few thousandths of the chamber neck diameter. Fitted correctly, brass only expands about .002" upon firing which aids in accuracy and prevents the necks from being over expanded. Cases normally require VERY little resizing. The neck turning operation also provides for very uniform neck wall thickness which also aids in accuracy. I have never seen factory ammo that would fit in the chamber of a tight neck rifle. But I guess one should never say NEVER. Typically, custom barrels with tight neck chambers have the neck diameter engraved into the barrel right next to the cartridge designation, but not always. In my experience, a tight neck chamber is a bad idea for a hunting rifle. All work and no benefit. The only exception would be in a looongrange hunting rifle, particularely where the targets are small varmints. VH [/QUOTE]
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Tight neck chamber
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