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Rifles, Reloading, Optics, Equipment
Reloading
Velocity Spreads?
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<blockquote data-quote="Mike6158" data-source="post: 338938" data-attributes="member: 1039"><p>Actually my statistical reference was about standard deviation. It doesn't matter if you are speaking of bad apples to good apples in a crate or velocity variations in your pet load, the calculation is a statistical calculation and more data points equals more robust output data. The people at Shooting Chrony recommend a minimum of 10 data points. </p><p></p><p>From the Shooting Chrony Manual:</p><p></p><p>There's a reason that their higher end chronographs are capable of larger shot strings.</p><p></p><p>ES is different. My suggestion was that if you want to use ES then use it, however, how the gun shoots is a much better indicator than ES imho. Not saying it's not useful. But ES is an indicator of the variability of the load more than anything (not saying it's the only indicator but it's the primary indicator imho). How consistent is the powder burning in your rifle / barrel combination? How consistent is the batch of primers that you used? How well did you measure the powder? How consistently did you seat the bullet? How consistent is the neck tension? How consistent does the barrel remain as you foul it with more and more rounds? I imagine that I'm leaving a lot out.</p><p></p><p>I don't see Long Range shooting as a game of probabilities. However there is a probability of success given a set of conditions. That's one of the reasons we reload and people build custom rifles and custom barrels. Decreasing statistical variability increases the odds of hitting where you aim. </p><p></p><p>Anyway... I'm not going to beat this to death. I don't spend a lot of time looking at chrony data because it takes too much time to do it right (for me). I shoot paper and when things get right I get the satisfaction of seeing the results and I get the pleasure of watching the load come together.</p></blockquote><p></p>
[QUOTE="Mike6158, post: 338938, member: 1039"] Actually my statistical reference was about standard deviation. It doesn't matter if you are speaking of bad apples to good apples in a crate or velocity variations in your pet load, the calculation is a statistical calculation and more data points equals more robust output data. The people at Shooting Chrony recommend a minimum of 10 data points. From the Shooting Chrony Manual: There's a reason that their higher end chronographs are capable of larger shot strings. ES is different. My suggestion was that if you want to use ES then use it, however, how the gun shoots is a much better indicator than ES imho. Not saying it's not useful. But ES is an indicator of the variability of the load more than anything (not saying it's the only indicator but it's the primary indicator imho). How consistent is the powder burning in your rifle / barrel combination? How consistent is the batch of primers that you used? How well did you measure the powder? How consistently did you seat the bullet? How consistent is the neck tension? How consistent does the barrel remain as you foul it with more and more rounds? I imagine that I'm leaving a lot out. I don't see Long Range shooting as a game of probabilities. However there is a probability of success given a set of conditions. That's one of the reasons we reload and people build custom rifles and custom barrels. Decreasing statistical variability increases the odds of hitting where you aim. Anyway... I'm not going to beat this to death. I don't spend a lot of time looking at chrony data because it takes too much time to do it right (for me). I shoot paper and when things get right I get the satisfaction of seeing the results and I get the pleasure of watching the load come together. [/QUOTE]
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Velocity Spreads?
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