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Rifles, Reloading, Optics, Equipment
Reloading
How to use a chronograph to work up loads?
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<blockquote data-quote="SQ Stalker" data-source="post: 304384" data-attributes="member: 18663"><p>If you search to load development there's a couple good threads that'll help. I use mine for more data in addition to the targets. If all the groups are similar between several settings (ie. powder charge), than I'll choose the one with the best data from the chronograph.</p><p> </p><p>I think most people use Standard Deviation (SD) as the most important factor to determine an accurate load. You can also use Extreme Spread (ES) to help determine the best charge, or other setting.</p><p> </p><p>You can also examine the FPS data to try and perfect your loading procedure. Certain additional steps or performing an operation a certain way can help you SD and ES numbers shrink.</p><p> </p><p>For example when I started load development on my rifle I was getting 30 FPS of SD and 60 FPS of ES. Now that I've finished my load it averages around 7 FPS of SD and 13 FPS of ES. My best 5 shot string was 4.5 (SD) and 9 (ES).</p><p> </p><p>Good luck<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" /></p><p> </p><p>Stalker</p></blockquote><p></p>
[QUOTE="SQ Stalker, post: 304384, member: 18663"] If you search to load development there's a couple good threads that'll help. I use mine for more data in addition to the targets. If all the groups are similar between several settings (ie. powder charge), than I'll choose the one with the best data from the chronograph. I think most people use Standard Deviation (SD) as the most important factor to determine an accurate load. You can also use Extreme Spread (ES) to help determine the best charge, or other setting. You can also examine the FPS data to try and perfect your loading procedure. Certain additional steps or performing an operation a certain way can help you SD and ES numbers shrink. For example when I started load development on my rifle I was getting 30 FPS of SD and 60 FPS of ES. Now that I've finished my load it averages around 7 FPS of SD and 13 FPS of ES. My best 5 shot string was 4.5 (SD) and 9 (ES). Good luck:D Stalker [/QUOTE]
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Reloading
How to use a chronograph to work up loads?
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