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Rifles, Reloading, Optics, Equipment
Reloading
Expander Ball?
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<blockquote data-quote="bigedp51" data-source="post: 1408219" data-attributes="member: 28965"><p><span style="font-size: 18px"><span style="color: #0000b3"><span style="font-size: 15px">Redding bushing FAQ</span></span></span></p><p><span style="font-size: 18px"><span style="color: #0000b3"><span style="font-size: 15px">"If the neck wall thickness varies more than 0.002", it may be necessary to use a bushing a couple of thousandths smaller than your calculations indicate, and then use a size button in the die to determine the final inside neck diameter."</span></span></span></p><p></p><p><span style="font-size: 18px"><span style="font-size: 15px">Meaning there would be no advantage in using a bushing die with the average case with more than .002 neck thickness variations. I have Remington .223 cases with .009 thickness variations, and use them as blasting ammo in my AR15 rifle.</span></span></p><p></p><p><span style="font-size: 18px"><span style="font-size: 15px">Bottom line, bushing dies work best with neck turned brass in tight neck chambers. And standard full length dies with a expander will work fine with average Remchester cases.</span></span></p><p></p><p><span style="font-size: 18px"><span style="font-size: 15px">And at the Whidden custom die website they tell you they get the most concentric cases with full length non-bushing dies.</span></span></p><p><span style="font-size: 18px"></span></p><p><span style="font-size: 18px"><strong>Tech Line & Tips (FAQs)</strong></span></p><p><span style="font-size: 18px"><strong><a href="http://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection" target="_blank">Bushing Selection</a></strong></span></p><p><span style="font-size: 18px"><span style="font-size: 15px"><a href="http://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection" target="_blank">http://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection</a></span></span></p><p>There has been some confusion regarding the correct diameter bushing that should be used with Redding Bushing Style Sizing Dies. The most common misconception is that the bushing diameter is determined by the neck diameter of fired cases or the neck diameter of the chamber that the reloaded ammunition will be fired in. The bushing diameter is related to the chamber neck diameter, but only indirectly, in that the loaded cartridges must have adequate clearance at the neck to allow the bullet to be released properly upon firing.*</p><p></p><p>The easiest way to determine the proper diameter bushing is to measure the neck diameter of several loaded or dummy cartridges with an accurate micrometer. (These dummy cartridges can be loaded with your old set of dies or a borrowed set.) Then, simply subtract 0.001" from the cartridge that had the smallest average measurement. This will allow for a slight amount of spring back and create a proper press fit for the bullet.</p><p></p><p>Another method of determining bushing size, is to measure the neck wall thickness of the cartridge cases with a ball type or tubing micrometer. Double this measurement and add the bullet diameter to calculate the neck diameter of a loaded cartridge. As above, subtract 0.001" from this figure to determine bushing size. This method is the least desirable of the two, as a ball micrometer is fairly expensive and more difficult to read consistently than a conventional micrometer.</p><p></p><p>If you're starting with new cases, the neck wall thickness can be determined as above with a ball micrometer, or you can seat boat-tail bullets in a few cases and measure their neck diameter. Generally, the neck diameter of new cases is small enough to hold a bullet without sizing. As a last resort, you can measure the neck wall thickness of the cases with a caliper. Be aware that you may not select the correct bushing on the first try when using a caliper to measure neck wall thickness, due to the reduced measuring accuracy of the caliper.</p><p></p><p><strong>The above methods of determining bushing size require that the cases being sized have a fairly uniform neck wall thickness or have been neck turned. If the neck wall thickness varies more than 0.002", it may be necessary to use a bushing a couple of thousandths smaller than your calculations indicate, and then use a size button in the die to determine the final inside neck diameter.</strong></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1408219, member: 28965"] [SIZE=5][COLOR=#0000b3][SIZE=4]Redding bushing FAQ[/SIZE][/COLOR][/SIZE] [SIZE=5][COLOR=#0000b3][SIZE=4]"If the neck wall thickness varies more than 0.002", it may be necessary to use a bushing a couple of thousandths smaller than your calculations indicate, and then use a size button in the die to determine the final inside neck diameter."[/SIZE][/COLOR][/SIZE] [SIZE=5][SIZE=4]Meaning there would be no advantage in using a bushing die with the average case with more than .002 neck thickness variations. I have Remington .223 cases with .009 thickness variations, and use them as blasting ammo in my AR15 rifle.[/SIZE][/SIZE] [SIZE=5][SIZE=4]Bottom line, bushing dies work best with neck turned brass in tight neck chambers. And standard full length dies with a expander will work fine with average Remchester cases.[/SIZE][/SIZE] [SIZE=5][SIZE=4]And at the Whidden custom die website they tell you they get the most concentric cases with full length non-bushing dies.[/SIZE][/SIZE] [SIZE=5] [B]Tech Line & Tips (FAQs)[/B] [B][URL='http://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection']Bushing Selection[/URL][/B] [SIZE=4][URL]http://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection[/URL][/SIZE][B][/B][/SIZE] There has been some confusion regarding the correct diameter bushing that should be used with Redding Bushing Style Sizing Dies. The most common misconception is that the bushing diameter is determined by the neck diameter of fired cases or the neck diameter of the chamber that the reloaded ammunition will be fired in. The bushing diameter is related to the chamber neck diameter, but only indirectly, in that the loaded cartridges must have adequate clearance at the neck to allow the bullet to be released properly upon firing.* The easiest way to determine the proper diameter bushing is to measure the neck diameter of several loaded or dummy cartridges with an accurate micrometer. (These dummy cartridges can be loaded with your old set of dies or a borrowed set.) Then, simply subtract 0.001" from the cartridge that had the smallest average measurement. This will allow for a slight amount of spring back and create a proper press fit for the bullet. Another method of determining bushing size, is to measure the neck wall thickness of the cartridge cases with a ball type or tubing micrometer. Double this measurement and add the bullet diameter to calculate the neck diameter of a loaded cartridge. As above, subtract 0.001" from this figure to determine bushing size. This method is the least desirable of the two, as a ball micrometer is fairly expensive and more difficult to read consistently than a conventional micrometer. If you're starting with new cases, the neck wall thickness can be determined as above with a ball micrometer, or you can seat boat-tail bullets in a few cases and measure their neck diameter. Generally, the neck diameter of new cases is small enough to hold a bullet without sizing. As a last resort, you can measure the neck wall thickness of the cases with a caliper. Be aware that you may not select the correct bushing on the first try when using a caliper to measure neck wall thickness, due to the reduced measuring accuracy of the caliper. [B]The above methods of determining bushing size require that the cases being sized have a fairly uniform neck wall thickness or have been neck turned. If the neck wall thickness varies more than 0.002", it may be necessary to use a bushing a couple of thousandths smaller than your calculations indicate, and then use a size button in the die to determine the final inside neck diameter.[/B] [/QUOTE]
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