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Rifles, Reloading, Optics, Equipment
Reloading
Annealing winchester 300WSM brass.
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<blockquote data-quote="Brent" data-source="post: 58075" data-attributes="member: 99"><p>CP</p><p></p><p>I think your brass may be ok still, the .335 bushing is about right in order to arive at a .333 OD and here's why;</p><p></p><p>If you size down the necks that much, more than a few thou, what happens is the brass as it enters the bushing ID will actually overshoot the ID because of the angle it enters at and end up smaller than the ID. This is most common with factory chambers with near .010" total clearance in the neck area. </p><p></p><p>What you'll see with tight neck chambers with just a couple thou total clearance is that when sized the necks will end up larger than bushing ID because the necks enter the bushing a basically a zero angle, then springback allows them to get a thou or two larger when withdrawn.</p><p></p><p>The only chambers that will work closely are the "tighter than factory spec" but not real tight chambers. Somewhere in the .005 total clearance area. When the necks enter the bushing at enough of an angle that it produces necks that are undersize by an amount equal to the brass springback amount, it will equal the exact bushing ID... one usually overrides the other though.</p><p></p><p>Now, neck tension change again when brass gets harder and springback is affected... this is just something you need to watch, and you may need a size smaller bushing if you run just .001 - .002 total neck tension (press fit). Also accuracy may fall if nk tension changes... it can happen in a big way.</p><p></p><p>Taking carefull measurements during each the sizing operations will tell you what's happening and what needs to be done to end up where you desired to.</p></blockquote><p></p>
[QUOTE="Brent, post: 58075, member: 99"] CP I think your brass may be ok still, the .335 bushing is about right in order to arive at a .333 OD and here's why; If you size down the necks that much, more than a few thou, what happens is the brass as it enters the bushing ID will actually overshoot the ID because of the angle it enters at and end up smaller than the ID. This is most common with factory chambers with near .010" total clearance in the neck area. What you'll see with tight neck chambers with just a couple thou total clearance is that when sized the necks will end up larger than bushing ID because the necks enter the bushing a basically a zero angle, then springback allows them to get a thou or two larger when withdrawn. The only chambers that will work closely are the "tighter than factory spec" but not real tight chambers. Somewhere in the .005 total clearance area. When the necks enter the bushing at enough of an angle that it produces necks that are undersize by an amount equal to the brass springback amount, it will equal the exact bushing ID... one usually overrides the other though. Now, neck tension change again when brass gets harder and springback is affected... this is just something you need to watch, and you may need a size smaller bushing if you run just .001 - .002 total neck tension (press fit). Also accuracy may fall if nk tension changes... it can happen in a big way. Taking carefull measurements during each the sizing operations will tell you what's happening and what needs to be done to end up where you desired to. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Annealing winchester 300WSM brass.
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