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Concentricity
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<blockquote data-quote="MontanaRifleman" data-source="post: 854488" data-attributes="member: 11717"><p>I like to measure the bulletsshank/bearing surface if any is showing or down the ogive near the bearing surface. I have only received my Wilson concentricity gauge about a couple of years ago and it has helped me a lot in learning how to prep and size brass and seat bullets for concentric loads.</p><p></p><p>That said, I have not seen any noticeable difference between rounds showing .001 runout give or take to loads in the .008-009 range. Not saying concentric loads aren't any better than non-concentric, I just haven't seen the diff. I have shot a lot of sub 1/2 MOA groups with runout in the .005-.009 range.</p><p></p><p>A couple weeks ago I loded up 8 barrel accuracy test rounds for my new 6-284 before sending off for nitriding. 4 were in the .0005-.002 range and 4 were in the .005.-008 range. BTW, I had neck down the Lapua 6.4-284 brass to 6mm with a bushing die, nad that some times created neck runout. I had just cleaned the barrel so I thought I would shoot the 4 worse one first to sight in and foul the barrel. After shooting the first round, I adjusted the scope and shot the next three into a nice .4 group. This was just my mild break-in load and no accuracy development. I switched to a different target for the last 4 and the first of those landed in the same group area as the previous 3. The next 3 shifted left about and inch and printed about a .7 MOA verticla string for some reason making the total 4 group about 1 MOA for the "straighter" bullets. Maybe it was me? Moral of the story.... I think there are a lot of other factors that affect accuracy more than runout.</p><p></p><p>Now, when you have everything else dialed in, maybe good concentricity will get you a little more precision on the target. I'm guessing it helps the BR shooters.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 854488, member: 11717"] I like to measure the bulletsshank/bearing surface if any is showing or down the ogive near the bearing surface. I have only received my Wilson concentricity gauge about a couple of years ago and it has helped me a lot in learning how to prep and size brass and seat bullets for concentric loads. That said, I have not seen any noticeable difference between rounds showing .001 runout give or take to loads in the .008-009 range. Not saying concentric loads aren't any better than non-concentric, I just haven't seen the diff. I have shot a lot of sub 1/2 MOA groups with runout in the .005-.009 range. A couple weeks ago I loded up 8 barrel accuracy test rounds for my new 6-284 before sending off for nitriding. 4 were in the .0005-.002 range and 4 were in the .005.-008 range. BTW, I had neck down the Lapua 6.4-284 brass to 6mm with a bushing die, nad that some times created neck runout. I had just cleaned the barrel so I thought I would shoot the 4 worse one first to sight in and foul the barrel. After shooting the first round, I adjusted the scope and shot the next three into a nice .4 group. This was just my mild break-in load and no accuracy development. I switched to a different target for the last 4 and the first of those landed in the same group area as the previous 3. The next 3 shifted left about and inch and printed about a .7 MOA verticla string for some reason making the total 4 group about 1 MOA for the "straighter" bullets. Maybe it was me? Moral of the story.... I think there are a lot of other factors that affect accuracy more than runout. Now, when you have everything else dialed in, maybe good concentricity will get you a little more precision on the target. I'm guessing it helps the BR shooters. [/QUOTE]
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