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Rifles, Reloading, Optics, Equipment
Reloading
Ladder testing at 1k- Detailed article and video
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<blockquote data-quote="Bart B" data-source="post: 1198582" data-attributes="member: 5302"><p>One thing I've learned shooting long range matches shooting thousands of 3-shot groups in strings of 17 to near 30 shots......</p><p></p><p>Their sizes have a 4X to 5X spread. </p><p></p><p>Sometimes, three shots will cluster inside 3 to 4 inches. Other times they are 15 inches or more extreme spread. Once in a while they're a lot bigger.</p><p></p><p>Nobody I know of shoots 3-shot groups at any range with the same load that are always under a 10% spread in center to center of the widest shots.</p><p></p><p>Judging a load's accuracy with only 3 shots is a waste of my time.</p><p></p><p>If you've ever looked at the dozens of 5- and 10-shot groups shot with the same benchrest rifle and ammo over a 2 or 3 day match (long, mediuim or short range), you'll see a 3X to 5X spread in their sizes; sometimes more. 3-shot groups have bigger spreads than 5- or 10-shot ones. In spite of this, many, many rifle shooters testing their loads for accuracy think all 3-shot groups with the same load will shoot the same size groups and have no reason to shoot more shots in a group.</p><p></p><p>'Tis my opinion your loads putting those 3-shot groups on target are statistically equal. Shoot at least 20 shots with each load then compare those group sizes.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1198582, member: 5302"] One thing I've learned shooting long range matches shooting thousands of 3-shot groups in strings of 17 to near 30 shots...... Their sizes have a 4X to 5X spread. Sometimes, three shots will cluster inside 3 to 4 inches. Other times they are 15 inches or more extreme spread. Once in a while they're a lot bigger. Nobody I know of shoots 3-shot groups at any range with the same load that are always under a 10% spread in center to center of the widest shots. Judging a load's accuracy with only 3 shots is a waste of my time. If you've ever looked at the dozens of 5- and 10-shot groups shot with the same benchrest rifle and ammo over a 2 or 3 day match (long, mediuim or short range), you'll see a 3X to 5X spread in their sizes; sometimes more. 3-shot groups have bigger spreads than 5- or 10-shot ones. In spite of this, many, many rifle shooters testing their loads for accuracy think all 3-shot groups with the same load will shoot the same size groups and have no reason to shoot more shots in a group. 'Tis my opinion your loads putting those 3-shot groups on target are statistically equal. Shoot at least 20 shots with each load then compare those group sizes. [/QUOTE]
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Ladder testing at 1k- Detailed article and video
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