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The Range
Ammo & Reloading
Chronograph help...
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<blockquote data-quote="ASP785" data-source="post: 2668882" data-attributes="member: 12170"><p>Its important to know your velocity if you are using a ballistic calculator. With that being said, velocity is secondary for me when using a chronograph. I am really interested in finding out how consistent a given load is. I will shoot 10 rounds through the chronograph and get the Standard Deviation and Extreme Spread of that particular load. The lower the SD and ES, the more consistent the load is. If I have an ES of 100, I know that my loads aren't very consistent round to round. That deviation will show up on paper as vertical stringing as distance starts to increase. </p><p></p><p>If you have 1 round out of a group of 5-10 shots that is an outlier, something could be wrong with just that round. If you have multiple rounds with large variations from the average, then something is probably wrong with your process. This is where it gets interesting. It could be the amount of powder, bullet depth, primer pocket size, neck tension....etc etc. You have to figure that out through load development. The chronograph will just give you the data to determine if the load is consistent from shot to shot.</p></blockquote><p></p>
[QUOTE="ASP785, post: 2668882, member: 12170"] Its important to know your velocity if you are using a ballistic calculator. With that being said, velocity is secondary for me when using a chronograph. I am really interested in finding out how consistent a given load is. I will shoot 10 rounds through the chronograph and get the Standard Deviation and Extreme Spread of that particular load. The lower the SD and ES, the more consistent the load is. If I have an ES of 100, I know that my loads aren't very consistent round to round. That deviation will show up on paper as vertical stringing as distance starts to increase. If you have 1 round out of a group of 5-10 shots that is an outlier, something could be wrong with just that round. If you have multiple rounds with large variations from the average, then something is probably wrong with your process. This is where it gets interesting. It could be the amount of powder, bullet depth, primer pocket size, neck tension....etc etc. You have to figure that out through load development. The chronograph will just give you the data to determine if the load is consistent from shot to shot. [/QUOTE]
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