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Rifles, Reloading, Optics, Equipment
Reloading
Understanding ES and how to fix it
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<blockquote data-quote="dsculley" data-source="post: 1247802" data-attributes="member: 77514"><p>If the numbers from your chronograph are important to you, pay more attention to SD than ES. Your TRUE ES for that load is six times the standard deviation! </p><p></p><p>Personally, I tend to believe my target more than my chronograph. Is there a lot of vertical in the rounds fired? If not, it really doesn't matter what your chronograph said, the load is good. Personally, if I have a load shooting as well as the one you pictured, I would not worry about what my chronograph said. Mostly, I use the chronograph to keep me out of trouble. The first sign of over pressure you will see are muzzle velocities that exceed documented max velocities. When you see that it is time to back off. Once I choose a load, I don't use my chronograph much. I just prove that load on targets. As long as the load shoots well out to my expected max range I am good to go. Of course, "shooting well" can vary from person to person and from application to application.</p><p></p><p>To get good data from the chronograph, you need more than a few (3-5) rounds through it. While this is academic, I can generate velocities for two different 10 round strings that have the same ES. The SD of the strings will be drastically different based on whether they group around the center or around the extremes of the spread. If you evaluated them on ES only, you would conclude they are equal but that would be an error.</p><p></p><p>FWIW</p></blockquote><p></p>
[QUOTE="dsculley, post: 1247802, member: 77514"] If the numbers from your chronograph are important to you, pay more attention to SD than ES. Your TRUE ES for that load is six times the standard deviation! Personally, I tend to believe my target more than my chronograph. Is there a lot of vertical in the rounds fired? If not, it really doesn't matter what your chronograph said, the load is good. Personally, if I have a load shooting as well as the one you pictured, I would not worry about what my chronograph said. Mostly, I use the chronograph to keep me out of trouble. The first sign of over pressure you will see are muzzle velocities that exceed documented max velocities. When you see that it is time to back off. Once I choose a load, I don't use my chronograph much. I just prove that load on targets. As long as the load shoots well out to my expected max range I am good to go. Of course, "shooting well" can vary from person to person and from application to application. To get good data from the chronograph, you need more than a few (3-5) rounds through it. While this is academic, I can generate velocities for two different 10 round strings that have the same ES. The SD of the strings will be drastically different based on whether they group around the center or around the extremes of the spread. If you evaluated them on ES only, you would conclude they are equal but that would be an error. FWIW [/QUOTE]
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Understanding ES and how to fix it
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