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Rifles, Reloading, Optics, Equipment
Reloading
Standard Deviation & Extreme Spread - What does it take?
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<blockquote data-quote="J E Custom" data-source="post: 1332456" data-attributes="member: 2736"><p>It could be anything and you may have to start over.</p><p></p><p>I used to struggle with load work up and would spend many hours and components before arriving at my goal so I changed the way I loaded and here is "MY" way and it works well for me.</p><p></p><p>First I start with a powder that gets me 98+ % case capacity at or near</p><p>max listed pressure with the bullet weight of choice (Not the biggest or the fastest, but the best weight for what I will be doing with it). </p><p>Then based on the powder I choose, I pick an optimum primer for that powder.</p><p></p><p>After loading 5 rounds of each different selected powders several grains below maximum, to Magazine length I go to the range to chronograph them.</p><p></p><p>What I am looking for is SDs below 10. I am not looking for groups yet because I am looking for a good powder, primer combination in that case capacity, with the bullet weight preferred.</p><p></p><p>If I get the desired SD and ES with one load or see a trend that leads me to the best powder primer combination then and only then do I start working on accuracy. I have found that good SD/ES does not automatically mean good accuracy and good accuracy does not automatically mean good SDs and ESs so I work on one at a time. Done be narrow minded about the choice of powders because what works well in some rifles may not work in your rifle. There are powders that I prefer based on many factors, and there are powders that I don't particularly like, but use them because the rifle, barrel, chamber combination does.</p><p></p><p>Normally If I get good SDs and poor accuracy It is the bullet weight or shape. If I get good groups but poor SDs it is the load (Powder or primer combo) and not the bullet (It tells me that My barrel likes that bullet but not the load.</p><p></p><p>The reason I load this way is for long range accuracy and have found that if the SD and ESs are not good, the accuracy is inconsistent at longer ranges.</p><p></p><p>It has also minimized the number of test loads in order to reach an accurate load by working on one thing at a time. I can normally find a really good load with less that 20 shots. After everything is doing well,</p><p>I start tweaking the load COAL to see if better accuracy Is possible by shortening or lengthening within the Magazine length. If the load/rifle seem to like load lengths longer than magazine length, I decide then based on use, if I want to single load.</p><p></p><p>This is just the way I load to solve/find good SDs and accuracy without</p><p>a hit or miss approach.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1332456, member: 2736"] It could be anything and you may have to start over. I used to struggle with load work up and would spend many hours and components before arriving at my goal so I changed the way I loaded and here is "MY" way and it works well for me. First I start with a powder that gets me 98+ % case capacity at or near max listed pressure with the bullet weight of choice (Not the biggest or the fastest, but the best weight for what I will be doing with it). Then based on the powder I choose, I pick an optimum primer for that powder. After loading 5 rounds of each different selected powders several grains below maximum, to Magazine length I go to the range to chronograph them. What I am looking for is SDs below 10. I am not looking for groups yet because I am looking for a good powder, primer combination in that case capacity, with the bullet weight preferred. If I get the desired SD and ES with one load or see a trend that leads me to the best powder primer combination then and only then do I start working on accuracy. I have found that good SD/ES does not automatically mean good accuracy and good accuracy does not automatically mean good SDs and ESs so I work on one at a time. Done be narrow minded about the choice of powders because what works well in some rifles may not work in your rifle. There are powders that I prefer based on many factors, and there are powders that I don't particularly like, but use them because the rifle, barrel, chamber combination does. Normally If I get good SDs and poor accuracy It is the bullet weight or shape. If I get good groups but poor SDs it is the load (Powder or primer combo) and not the bullet (It tells me that My barrel likes that bullet but not the load. The reason I load this way is for long range accuracy and have found that if the SD and ESs are not good, the accuracy is inconsistent at longer ranges. It has also minimized the number of test loads in order to reach an accurate load by working on one thing at a time. I can normally find a really good load with less that 20 shots. After everything is doing well, I start tweaking the load COAL to see if better accuracy Is possible by shortening or lengthening within the Magazine length. If the load/rifle seem to like load lengths longer than magazine length, I decide then based on use, if I want to single load. This is just the way I load to solve/find good SDs and accuracy without a hit or miss approach. J E CUSTOM [/QUOTE]
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Standard Deviation & Extreme Spread - What does it take?
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