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Rifles, Reloading, Optics, Equipment
Reloading
Neck bushing dies
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<blockquote data-quote="long ranger" data-source="post: 186355" data-attributes="member: 800"><p>Your plainjane dies do exert the same neck dimension assuming your brass is identical. The difference is in you have no say in what that dimension or amount of tension is.</p><p>The bushing type dies are used to get optimum neck tension for a particular neck thickness and chamber dimension.</p><p>Differences in chamber size and brass thickness can not be addressed with standard dies as easily as with interchangeable bushing in .001 increments.</p><p>Eg. 308 caliber chamber when firing Lapua brass that has a neck wall thickness of .012, leaves the fired case with a neck dimension of .335 so you would use a .333 bushing.</p><p>If you used Winchester or remington brass you may need a bigger or smaller bushing as the neck wall thickness may be bigger or smaller.</p><p>Your generic dies would have a neck size of .330 to make sure you get tension regardless of neck wall thickness, this can work your brass more than necessary, shortening its life span.</p><p>Differences in chamber specs will also change the dimensions of the fired case hence the bushing diameter will change as well.</p><p>The numbers I used are not necessarily the exact dimensions but hopefully you get the idea</p></blockquote><p></p>
[QUOTE="long ranger, post: 186355, member: 800"] Your plainjane dies do exert the same neck dimension assuming your brass is identical. The difference is in you have no say in what that dimension or amount of tension is. The bushing type dies are used to get optimum neck tension for a particular neck thickness and chamber dimension. Differences in chamber size and brass thickness can not be addressed with standard dies as easily as with interchangeable bushing in .001 increments. Eg. 308 caliber chamber when firing Lapua brass that has a neck wall thickness of .012, leaves the fired case with a neck dimension of .335 so you would use a .333 bushing. If you used Winchester or remington brass you may need a bigger or smaller bushing as the neck wall thickness may be bigger or smaller. Your generic dies would have a neck size of .330 to make sure you get tension regardless of neck wall thickness, this can work your brass more than necessary, shortening its life span. Differences in chamber specs will also change the dimensions of the fired case hence the bushing diameter will change as well. The numbers I used are not necessarily the exact dimensions but hopefully you get the idea [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Neck bushing dies
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