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Rifles, Reloading, Optics, Equipment
Reloading
Neck diameter clearance on tight neck chamber
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<blockquote data-quote="J E Custom" data-source="post: 1837323" data-attributes="member: 2736"><p>I recommend .003 to .004 clearance to allow the case neck to cleanly release the bullet. On many rifles that are magnum cartridges to little clearance will produce unnecessary pressure. Smaller calibers have less trouble with this phenomenon. </p><p></p><p>The reason you want/need .003 minimum is that you already have several thousandths bullet grip and without one or more thousandths larger than the neck is sized, the neck really doesn't release the bullet enough. So when you add the .002 under size for bullet grip then add another =.001</p><p>you end up with .003 total effective clearance in order to release the bullet without adding more unnecessary pressure. That's why most like .004 (It gives you.002 thousandths total release) .001 thousandths on each side.</p><p></p><p>Some cartridges use .006 and dangerous game rifles will even go to .008 total clearance for dependability and chambering.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1837323, member: 2736"] I recommend .003 to .004 clearance to allow the case neck to cleanly release the bullet. On many rifles that are magnum cartridges to little clearance will produce unnecessary pressure. Smaller calibers have less trouble with this phenomenon. The reason you want/need .003 minimum is that you already have several thousandths bullet grip and without one or more thousandths larger than the neck is sized, the neck really doesn't release the bullet enough. So when you add the .002 under size for bullet grip then add another =.001 you end up with .003 total effective clearance in order to release the bullet without adding more unnecessary pressure. That's why most like .004 (It gives you.002 thousandths total release) .001 thousandths on each side. Some cartridges use .006 and dangerous game rifles will even go to .008 total clearance for dependability and chambering. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck diameter clearance on tight neck chamber
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