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Rifles, Reloading, Optics, Equipment
Reloading
Ugly extreme spread........now what ?
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<blockquote data-quote="J E Custom" data-source="post: 1672894" data-attributes="member: 2736"><p>SDs and ES are affected by the load itself most of the time. A good primer, powder and bullet weight will normally give good SDs. A poor combination of these components will result in poor SDs and ES.</p><p></p><p>I look for SDs of single digit numbers (.00 to .09) sometimes that is hard to find on small calibers and light bullets So they can be in the teens and still shoot well. If a load produces a SD of over .20 I abandon it and look for a different powder or bullet weight. after a good SD is found, it can be improved with subtle changes in primers or seating depth.</p><p></p><p>Distance doesn't change these numbers, just the amount of error in the POI. The greater the SD and ES spread, the greater the impact error at longer distance. With an es over 40 I would recommend changing powders. Vertical stringing is a sign that you have poor ES.</p><p>Horizontal stringing or large group size is an indication of other problems.</p><p></p><p>When testing a hunting rifle, I prefer to shoot a 3 shot groups And clean the rifle. This allows for it to cool and also requires that each load is tested using the same conditions. It will also show if the barrel needs a fouling shot or not making the cold bore shot the most important. </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1672894, member: 2736"] SDs and ES are affected by the load itself most of the time. A good primer, powder and bullet weight will normally give good SDs. A poor combination of these components will result in poor SDs and ES. I look for SDs of single digit numbers (.00 to .09) sometimes that is hard to find on small calibers and light bullets So they can be in the teens and still shoot well. If a load produces a SD of over .20 I abandon it and look for a different powder or bullet weight. after a good SD is found, it can be improved with subtle changes in primers or seating depth. Distance doesn't change these numbers, just the amount of error in the POI. The greater the SD and ES spread, the greater the impact error at longer distance. With an es over 40 I would recommend changing powders. Vertical stringing is a sign that you have poor ES. Horizontal stringing or large group size is an indication of other problems. When testing a hunting rifle, I prefer to shoot a 3 shot groups And clean the rifle. This allows for it to cool and also requires that each load is tested using the same conditions. It will also show if the barrel needs a fouling shot or not making the cold bore shot the most important. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ugly extreme spread........now what ?
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