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Rifles, Reloading, Optics, Equipment
Reloading
Help! Extreme spread and standard deviation loads
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<blockquote data-quote="MontanaRifleman" data-source="post: 493191" data-attributes="member: 11717"><p>Well first, I have to apologize because for some reason I thought this was a 300 RUM and it's a 308 Win. Barrel life shouldn't be a big issue.</p><p></p><p>Somethings to think about... </p><p></p><p>I can pretty much guarantee you that your chrony has some error. Just how much error is hard to know. If $100 Shooting Chrony's were perfect instruments, Oehler's wouldn't sell for multiple hundreds of dollars, and even they are not perfect. I have two chrony's and have shot them back to back and they have deviated from 5-60 fps on the same string.</p><p></p><p>When it comes to statistics, it always helps to have good sample sizes. SD really doesn't mean anything on a 5 shot string and not much on a 10 string.</p><p></p><p>As you are trying new loads, keep shooting this load and record the data. See how much variation you get from string to string in ES and Average velocity. shoot during different times of day, morning, midday, afternoon and evening. im my experiences, the sun's aspect has always had an effect on what my chrony's spit out.</p><p></p><p>For a 308 to be shooting as well as your's is to 350 yds, I really don't think you have an 80 FPS ES. According to the ballistic calc, an 80 ES would result in almost a 1 1/2" diff in POI @ 350 yds, not to mention the accuracy of the rifle and all the other factors. I think you have a pretty good load there, but I could think of worse ways to spend your time and $$$ trying to improve it <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 493191, member: 11717"] Well first, I have to apologize because for some reason I thought this was a 300 RUM and it's a 308 Win. Barrel life shouldn't be a big issue. Somethings to think about... I can pretty much guarantee you that your chrony has some error. Just how much error is hard to know. If $100 Shooting Chrony's were perfect instruments, Oehler's wouldn't sell for multiple hundreds of dollars, and even they are not perfect. I have two chrony's and have shot them back to back and they have deviated from 5-60 fps on the same string. When it comes to statistics, it always helps to have good sample sizes. SD really doesn't mean anything on a 5 shot string and not much on a 10 string. As you are trying new loads, keep shooting this load and record the data. See how much variation you get from string to string in ES and Average velocity. shoot during different times of day, morning, midday, afternoon and evening. im my experiences, the sun's aspect has always had an effect on what my chrony's spit out. For a 308 to be shooting as well as your's is to 350 yds, I really don't think you have an 80 FPS ES. According to the ballistic calc, an 80 ES would result in almost a 1 1/2" diff in POI @ 350 yds, not to mention the accuracy of the rifle and all the other factors. I think you have a pretty good load there, but I could think of worse ways to spend your time and $$$ trying to improve it :) [/QUOTE]
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Help! Extreme spread and standard deviation loads
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