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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity .. how important?
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<blockquote data-quote="J E Custom" data-source="post: 1439766" data-attributes="member: 2736"><p>It's been a while since i did a concentricity test but I will try to remember the results as best i can.</p><p></p><p>I loaded 40 rounds with the same components and shot them in the same rifle. This load was my accuracy load for my 7/08 that will consistently shoot 1/10 tenth moa groups.</p><p></p><p>After loading, I measured all rounds for concentricity and sorted in this order. </p><p>Zero runout.</p><p>.001 thousandths.</p><p>.002 thousandths.</p><p>.003 thousandths</p><p>.004 thousandths</p><p>and over .004.</p><p></p><p>All rounds over .004 were straightened and sorted in this order</p><p>Zero runout.</p><p>.001 thousandths </p><p>None of the straightened cartridges were over .001 after straightening.</p><p></p><p>Obviously, the zero runout as loaded were the best.</p><p>.001 to .002 showded very little accuracy loss over the zero runout loads @ 100 yards. 200 yards you "could" see a slight difference </p><p>The greater the runout the worse the accuracy.</p><p></p><p>During this test it became obvious that any ammo loaded with greater than .003 thousandths of runout was unexceptable for someone that strived for accuracy.</p><p></p><p>Oddly, any load that had been straightened, even though they had zero runout did not shoot as well as those loaded with zero runout. and the ones with greater than zero runout shot about as good as the .003+loaded ones.</p><p></p><p>So I came to the conclusion that the more concentric your ammo is the more accuracy you will have. The chamber, the bullets and cartridges/ammo shoots best if it is concentric to the barrel bore.</p><p>depending on the shooters skills, concentricity may not be a factor at 1 to 200 yards but beyond that It does make a difference.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1439766, member: 2736"] It's been a while since i did a concentricity test but I will try to remember the results as best i can. I loaded 40 rounds with the same components and shot them in the same rifle. This load was my accuracy load for my 7/08 that will consistently shoot 1/10 tenth moa groups. After loading, I measured all rounds for concentricity and sorted in this order. Zero runout. .001 thousandths. .002 thousandths. .003 thousandths .004 thousandths and over .004. All rounds over .004 were straightened and sorted in this order Zero runout. .001 thousandths None of the straightened cartridges were over .001 after straightening. Obviously, the zero runout as loaded were the best. .001 to .002 showded very little accuracy loss over the zero runout loads @ 100 yards. 200 yards you "could" see a slight difference The greater the runout the worse the accuracy. During this test it became obvious that any ammo loaded with greater than .003 thousandths of runout was unexceptable for someone that strived for accuracy. Oddly, any load that had been straightened, even though they had zero runout did not shoot as well as those loaded with zero runout. and the ones with greater than zero runout shot about as good as the .003+loaded ones. So I came to the conclusion that the more concentric your ammo is the more accuracy you will have. The chamber, the bullets and cartridges/ammo shoots best if it is concentric to the barrel bore. depending on the shooters skills, concentricity may not be a factor at 1 to 200 yards but beyond that It does make a difference. J E CUSTOM [/QUOTE]
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Concentricity .. how important?
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