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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
308 neck advise
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<blockquote data-quote="Bart B" data-source="post: 111444" data-attributes="member: 5302"><p>I'd get a chamber neck diameter of about .345-inch. That way you can use virtually any cartridge case; thick or thin neck walled. Such chamber neck diameters have been used with cases having .012-inch thick neck walls to shoot many, many sub half-MOA 10+ shot groups through 800 yards. Which pretty much dispels the theory that tight necks have to be used if best accuracy is an objective.</p><p></p><p>One nice thing about having lots of clearance around the loaded round's case neck is if it's not pretty straight, it still won't bear against the chamber neck wall which can cause accuracy problems.</p><p></p><p>A normal SAAMI chamber reamer at the minimum specs should do fine. Be sure to have chamber headspace set to between 1.630- and 1.631-inch.</p></blockquote><p></p>
[QUOTE="Bart B, post: 111444, member: 5302"] I'd get a chamber neck diameter of about .345-inch. That way you can use virtually any cartridge case; thick or thin neck walled. Such chamber neck diameters have been used with cases having .012-inch thick neck walls to shoot many, many sub half-MOA 10+ shot groups through 800 yards. Which pretty much dispels the theory that tight necks have to be used if best accuracy is an objective. One nice thing about having lots of clearance around the loaded round's case neck is if it's not pretty straight, it still won't bear against the chamber neck wall which can cause accuracy problems. A normal SAAMI chamber reamer at the minimum specs should do fine. Be sure to have chamber headspace set to between 1.630- and 1.631-inch. [/QUOTE]
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308 neck advise
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