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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity - setting up dies - runout
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<blockquote data-quote="RDM416" data-source="post: 504828" data-attributes="member: 3745"><p>I agree with everything Boomtube said, very good advice....... except this part. Everyone may not see improvements with this method, but I sure do. I will typically size using about 7 or 8 partial strokes, then do the same with seating the bullet, taking special care with initially starting the bullet in the neck. I will lightly "tap" the bullet, then rotate and "tap" again with ever increasing pressure until the bullet gets fully started in the neck. Then I go ahead and seat it with one or two more strokes. </p><p></p><p>While I do load for several calibers, most of my loading is done for a couple of custom rifles using custom dies made by the rifle maker. With the EXACT same set up I can size and seat using a single stroke each and my runout will about .003 to .004 on average. I can use the method described earlier and reduce the runout down to LESS than .001 on 80% and no more than .002 on the rest.</p><p></p><p>One of the most respected smiths on this site suggested I try this a few years back when I was struggling to reduce runout. (don't wan to drag him into this or I would mention his name) </p><p></p><p>The way it was explained to me is that every die has some error however slight, and the same goes for every press. When you rotate the case during sizing or seating, you are spreading that error out over several points rather than all the error being in one direction. </p><p></p><p>I am not a machinist, so I am not going to claim I really understand fully how or why this works. I do know it works for me. I am skeptical enough to keep trying to prove it wrong. In the middle of loading 20 rounds I often take 1 and just size and seat in a single stroke, runout will almost always be at least (often more) .002 more than the rest of my loads. I will also admit to being a little "obsessive" about runout. Many well respected shooters will say that around .003 or .004 is "good enough". My equipment is usually set up to produce that level of runout even without rotating. </p><p></p><p>I'm certainly not trying to start an argument with boomtube, and will admit to being wrong before (only once or twice if you don't ask my wife<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />) but the "rotate" method sure seems to work for me.</p></blockquote><p></p>
[QUOTE="RDM416, post: 504828, member: 3745"] I agree with everything Boomtube said, very good advice....... except this part. Everyone may not see improvements with this method, but I sure do. I will typically size using about 7 or 8 partial strokes, then do the same with seating the bullet, taking special care with initially starting the bullet in the neck. I will lightly "tap" the bullet, then rotate and "tap" again with ever increasing pressure until the bullet gets fully started in the neck. Then I go ahead and seat it with one or two more strokes. While I do load for several calibers, most of my loading is done for a couple of custom rifles using custom dies made by the rifle maker. With the EXACT same set up I can size and seat using a single stroke each and my runout will about .003 to .004 on average. I can use the method described earlier and reduce the runout down to LESS than .001 on 80% and no more than .002 on the rest. One of the most respected smiths on this site suggested I try this a few years back when I was struggling to reduce runout. (don't wan to drag him into this or I would mention his name) The way it was explained to me is that every die has some error however slight, and the same goes for every press. When you rotate the case during sizing or seating, you are spreading that error out over several points rather than all the error being in one direction. I am not a machinist, so I am not going to claim I really understand fully how or why this works. I do know it works for me. I am skeptical enough to keep trying to prove it wrong. In the middle of loading 20 rounds I often take 1 and just size and seat in a single stroke, runout will almost always be at least (often more) .002 more than the rest of my loads. I will also admit to being a little "obsessive" about runout. Many well respected shooters will say that around .003 or .004 is "good enough". My equipment is usually set up to produce that level of runout even without rotating. I'm certainly not trying to start an argument with boomtube, and will admit to being wrong before (only once or twice if you don't ask my wife:D) but the "rotate" method sure seems to work for me. [/QUOTE]
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Concentricity - setting up dies - runout
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