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Rifles, Reloading, Optics, Equipment
Reloading
Chronograph recomendations
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<blockquote data-quote="goodgrouper" data-source="post: 208649" data-attributes="member: 2852"><p>I have to disagree on several points. The 3 shot group has plenty of validity to it especially when you re-test that load again and it proves itself over. On magnum rifles with skinny barrels, this is pretty well the only method to use as the barrel heats up you can get bad data from a 5 shot group especially in warm weather. I have seen many people toss out "bad loads" with 5 shot groups because the last two shots went faster and in reality, the load could have been fine.</p><p></p><p>I also disagree that ES is a better measure of the uniformity of the load. The SD and ES are certainly related but the SD is a better "overall" indicator of the deviation from the norm just like it is named. Or in other words, the ES is the window of velocity but the SD is the variation found in that window.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 208649, member: 2852"] I have to disagree on several points. The 3 shot group has plenty of validity to it especially when you re-test that load again and it proves itself over. On magnum rifles with skinny barrels, this is pretty well the only method to use as the barrel heats up you can get bad data from a 5 shot group especially in warm weather. I have seen many people toss out "bad loads" with 5 shot groups because the last two shots went faster and in reality, the load could have been fine. I also disagree that ES is a better measure of the uniformity of the load. The SD and ES are certainly related but the SD is a better "overall" indicator of the deviation from the norm just like it is named. Or in other words, the ES is the window of velocity but the SD is the variation found in that window. [/QUOTE]
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