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Rifles, Reloading, Optics, Equipment
Reloading
How do you control neck tension?
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<blockquote data-quote="woods" data-source="post: 395115" data-attributes="member: 6042"><p>The bushing dies size the outside of the case neck to a specific dimension. When they size the outside, all the neck thickness variations are pushed to the inside. It is all but impossible to get 100% consistant neck thickness from outside neck turning (at lease IME) so there will be some variation in ID of neck when using the bushing dies. Unless you use the expander that comes with the bushing die which would not make a lot of sense since you could have accomplished that by using a much cheaper FL die.</p><p></p><p>The pin gauges costs me $55.00 and I got them from <a href="http://www.cdcotools.com/index.php" target="_blank">CDCO Machinery Corp.</a> . Go to measuring tools and then pin gauges and they are on the right hand side. It won't let me post a direct link to the exact page. I got the .250 to .500" ones.</p><p></p><p>I do a lot of hunting with loads sized with the Lee Collet. The caution is probably due to the Lee Collet not creating much of a bullet grip since the mandrels are typically only .001" below caliber. That is why they recommend using the Lee Factory Crimp die with the Lee Collet, to put a crimp on it. </p><p></p><p>But like boomtube said, there is little benefit to sizing the ID of the neck much smaller for excessive bullet grip since once your reach the elasticity of the brass it will stretch and hold with the same force if you sized to .002" less than caliber or .004" less than caliber. My guess is that point is .002" and the way I got that was from pulling bullets with different ID'S before seating and then measuring them with the pin gauges. They all returned to .002" less than caliber even if you started out .002" less or .004" less.</p><p></p><p>I ordered additional mandrels from Lee for $5.00 each and shoot for a .003" bullet grip. You can also spin the mandrel in a drill and hold some fine sandpaper against it to lower diameter, but that is much harder to do because you have to get the entire mandrel to a consistant smaller diameter since the entire mandrel goes down through the neck.</p><p></p><p>YMMV</p></blockquote><p></p>
[QUOTE="woods, post: 395115, member: 6042"] The bushing dies size the outside of the case neck to a specific dimension. When they size the outside, all the neck thickness variations are pushed to the inside. It is all but impossible to get 100% consistant neck thickness from outside neck turning (at lease IME) so there will be some variation in ID of neck when using the bushing dies. Unless you use the expander that comes with the bushing die which would not make a lot of sense since you could have accomplished that by using a much cheaper FL die. The pin gauges costs me $55.00 and I got them from [url=http://www.cdcotools.com/index.php]CDCO Machinery Corp.[/url] . Go to measuring tools and then pin gauges and they are on the right hand side. It won't let me post a direct link to the exact page. I got the .250 to .500" ones. I do a lot of hunting with loads sized with the Lee Collet. The caution is probably due to the Lee Collet not creating much of a bullet grip since the mandrels are typically only .001" below caliber. That is why they recommend using the Lee Factory Crimp die with the Lee Collet, to put a crimp on it. But like boomtube said, there is little benefit to sizing the ID of the neck much smaller for excessive bullet grip since once your reach the elasticity of the brass it will stretch and hold with the same force if you sized to .002" less than caliber or .004" less than caliber. My guess is that point is .002" and the way I got that was from pulling bullets with different ID'S before seating and then measuring them with the pin gauges. They all returned to .002" less than caliber even if you started out .002" less or .004" less. I ordered additional mandrels from Lee for $5.00 each and shoot for a .003" bullet grip. You can also spin the mandrel in a drill and hold some fine sandpaper against it to lower diameter, but that is much harder to do because you have to get the entire mandrel to a consistant smaller diameter since the entire mandrel goes down through the neck. YMMV [/QUOTE]
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How do you control neck tension?
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