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Rifles, Reloading, Optics, Equipment
Reloading
finding size to turn necks to
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<blockquote data-quote="bigedp51" data-source="post: 1495945" data-attributes="member: 28965"><p>For those of you with off the shelf factory rifles a .308 Winchester has a chamber neck .008 larger than the neck of a loaded round. Meaning approximately .004 clearance on each side of the case neck.</p><p></p><p>And you have no control of how much the case neck expands in a SAAMI chamber, "BUT" you still have to reduce the neck diameter that .008 plus approximately .004 when sizing the case neck with standard dies.</p><p></p><p>And the point I'm making is bushing dies work best with custom tight neck chambers and neck turned brass. And with a factory rifle most reloaders will not see any improvement in accuracy by neck turning their cases. And in another well known forum they are told to just buy Lapua brass and load and shoot without doing anything to the brass.</p><p></p><p>There are benchrest rifles that never hunt dangerous game and hunting rifles that have more wiggle room in the chamber for reliable function in the field.</p><p></p><p>And my old milsurp rifles have long fat chambers with plenty of case neck and case body clearance.</p><p></p><p>The late Jim Hull of the Sierra ballistic test lab had a humorous saying about full length resizing.</p><p></p><p>"The cartridge should fit the chamber like a rat turd in a violin case". Meaning give the cartridge a little wiggle room to let the bullet be self aligning in the throat. In fact the only part of the full length resized case that touches the chamber walls is the case shoulder when pushed forward by the ejector and firing pin.</p><p></p><p> <img src="https://i.imgur.com/RDNXFbN.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1495945, member: 28965"] For those of you with off the shelf factory rifles a .308 Winchester has a chamber neck .008 larger than the neck of a loaded round. Meaning approximately .004 clearance on each side of the case neck. And you have no control of how much the case neck expands in a SAAMI chamber, "BUT" you still have to reduce the neck diameter that .008 plus approximately .004 when sizing the case neck with standard dies. And the point I'm making is bushing dies work best with custom tight neck chambers and neck turned brass. And with a factory rifle most reloaders will not see any improvement in accuracy by neck turning their cases. And in another well known forum they are told to just buy Lapua brass and load and shoot without doing anything to the brass. There are benchrest rifles that never hunt dangerous game and hunting rifles that have more wiggle room in the chamber for reliable function in the field. And my old milsurp rifles have long fat chambers with plenty of case neck and case body clearance. The late Jim Hull of the Sierra ballistic test lab had a humorous saying about full length resizing. "The cartridge should fit the chamber like a rat turd in a violin case". Meaning give the cartridge a little wiggle room to let the bullet be self aligning in the throat. In fact the only part of the full length resized case that touches the chamber walls is the case shoulder when pushed forward by the ejector and firing pin. [IMG]https://i.imgur.com/RDNXFbN.png[/IMG] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
finding size to turn necks to
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