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Rifles, Reloading, Optics, Equipment
Reloading
full length re-sizing verses neck sizing
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<blockquote data-quote="Bill Johnson" data-source="post: 1022698" data-attributes="member: 84129"><p>It really doesn't matter how your fired cartridges compare to a headspace gage. You can't neck size forever anyway. Eventually you have to full length resize. So what you want to know is where to set up your dies to bump the shoulder back .002 from it's fired condition. This is relatively simple and inexpensive to do. Your cartridge's datum is where the shoulder measures about .458" </p><p> </p><p>Using a 7/16 ID bushing with a slight bevel as pictured below, you take a reading on your 10 cartridges, average, then compare to a case full length resized. The differential reading between the 2 is how much you are bumping the shoulder back full length resizing, setting up the die per the die instructions. The bushing pictured came from Home Depot and cost $4. I have a 3/8 bushing for 30-06 and 308. You do not have to hit right on the datum. As long as you are somewhere around midpoint of the shoulder, your differential reading will tell you what you need to know. </p><p> </p><p>Hypothetically, if you are setting the shoulder back .012, you want to raise the die .010 to get the .002 bump. You can do that by adjusting the die (put a .010 feeler gage on top of the shellholder and set the die per instructions) or you can use the die shims I mentioned previously or the different shellholders others have mentioned.</p><p> </p><p>This is old-school stuff that's been around a long time before they came out with the fancy and expensive comparative tools available now. </p><p> </p><p><a href="http://s813.photobucket.com/user/Dollar_Bill_2009/media/3006gaugingheadspace2.jpg.html" target="_blank"><img src="http://i813.photobucket.com/albums/zz53/Dollar_Bill_2009/3006gaugingheadspace2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></blockquote><p></p>
[QUOTE="Bill Johnson, post: 1022698, member: 84129"] It really doesn't matter how your fired cartridges compare to a headspace gage. You can't neck size forever anyway. Eventually you have to full length resize. So what you want to know is where to set up your dies to bump the shoulder back .002 from it's fired condition. This is relatively simple and inexpensive to do. Your cartridge's datum is where the shoulder measures about .458" Using a 7/16 ID bushing with a slight bevel as pictured below, you take a reading on your 10 cartridges, average, then compare to a case full length resized. The differential reading between the 2 is how much you are bumping the shoulder back full length resizing, setting up the die per the die instructions. The bushing pictured came from Home Depot and cost $4. I have a 3/8 bushing for 30-06 and 308. You do not have to hit right on the datum. As long as you are somewhere around midpoint of the shoulder, your differential reading will tell you what you need to know. Hypothetically, if you are setting the shoulder back .012, you want to raise the die .010 to get the .002 bump. You can do that by adjusting the die (put a .010 feeler gage on top of the shellholder and set the die per instructions) or you can use the die shims I mentioned previously or the different shellholders others have mentioned. This is old-school stuff that's been around a long time before they came out with the fancy and expensive comparative tools available now. [URL="http://s813.photobucket.com/user/Dollar_Bill_2009/media/3006gaugingheadspace2.jpg.html"][IMG]http://i813.photobucket.com/albums/zz53/Dollar_Bill_2009/3006gaugingheadspace2.jpg[/IMG][/URL] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
full length re-sizing verses neck sizing
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