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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning...min neck thickness
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<blockquote data-quote="J E Custom" data-source="post: 1936891" data-attributes="member: 2736"><p>Normal case neck expansion should be between .003 and .006 depending on your chamber. If you have a tight neck chamber you will want a fired case to be a minimum of .003 thousandths larger than the neck chamber in order to get consistent bullet releases. Any more only over works your brass, My personal preference is .004 (.002 per side). on dangerous game rifles you will want .006 to .008 (You don't worry about brass if hunting something that can/will kill you).</p><p></p><p>Fire formed cases are normally the most dependable for measuring the neck chamber diameter if you don't/can't make a chamber cast. The fired case dimension, plus the bullet diameter, plus the clearance you want, (.003 minimum) will tell you what your case neck wall should be for your chamber. Example: fired case neck measures= .335, minus bullet diameter of .308 = .027 minus .003 expansion =.024 divided by 2 = .014 is the neck wall thickness you should use as the maximum. less than that will cause no ill effects except shorter brass life. If your brass is work hardened annealing will give you a better/more accurate dimension. </p><p></p><p>I have seen neck wall thicknesses as thin as .010 that shot great but they were used in very tight neck chambers that cases had to be turned just to get the necessary expansion of the neck.</p><p></p><p>It really doesn't matter how thick or thin the neck wall is as long as it is uniform and within the .003 to .006 expansion range for your chamber. To tight = pressure, to loose = shorter case life and possibly accuracy if over sized.</p><p></p><p>Find out what your neck chamber size is and uniformly trim to have ,003 to ,006 clearance between a loaded round and your neck chamber dimension and all will be well.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1936891, member: 2736"] Normal case neck expansion should be between .003 and .006 depending on your chamber. If you have a tight neck chamber you will want a fired case to be a minimum of .003 thousandths larger than the neck chamber in order to get consistent bullet releases. Any more only over works your brass, My personal preference is .004 (.002 per side). on dangerous game rifles you will want .006 to .008 (You don't worry about brass if hunting something that can/will kill you). Fire formed cases are normally the most dependable for measuring the neck chamber diameter if you don't/can't make a chamber cast. The fired case dimension, plus the bullet diameter, plus the clearance you want, (.003 minimum) will tell you what your case neck wall should be for your chamber. Example: fired case neck measures= .335, minus bullet diameter of .308 = .027 minus .003 expansion =.024 divided by 2 = .014 is the neck wall thickness you should use as the maximum. less than that will cause no ill effects except shorter brass life. If your brass is work hardened annealing will give you a better/more accurate dimension. I have seen neck wall thicknesses as thin as .010 that shot great but they were used in very tight neck chambers that cases had to be turned just to get the necessary expansion of the neck. It really doesn't matter how thick or thin the neck wall is as long as it is uniform and within the .003 to .006 expansion range for your chamber. To tight = pressure, to loose = shorter case life and possibly accuracy if over sized. Find out what your neck chamber size is and uniformly trim to have ,003 to ,006 clearance between a loaded round and your neck chamber dimension and all will be well. J E CUSTOM [/QUOTE]
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Reloading
Neck turning...min neck thickness
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