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Rifles, Reloading, Optics, Equipment
Reloading
How do you lower S.D.?
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<blockquote data-quote="J E Custom" data-source="post: 188832" data-attributes="member: 2736"><p>KQguy</p><p></p><p>Lots of good information from everyone but maybe a little confusing</p><p>so I thought I,d re,post from a different perspective to help you out.</p><p></p><p>A looooong time ago there were no chronographs and all loads were</p><p>tested for group size at the max distance to be used.</p><p></p><p>If you shot High Power matches (200yrds, 300yrds, 600yrds and 1000</p><p>yrds)you worked up loads that would work best at 600yrds and 1000 yrds</p><p>that may not be the same. some would have loads for 200 and 300yrds</p><p>also.</p><p></p><p>Back then it was not unusual to test several hundred loads to find just</p><p>the right load for the task (targets or hunting).</p><p></p><p>And then along came the chonograph that the average person could </p><p>afford and changed the way a lot of people approached reloading.</p><p></p><p>I made all of the usual mistakes because in the beginning all I was </p><p>interested in was velocity. And I was still testing lots of loads.</p><p></p><p>Then I read an article written by a bench rest shooter, Well I,m no</p><p>bench rester but I can allways learn something new on how to work</p><p>up accurace loads with a minimum of loading. I have posted this </p><p>process before and will try to find it but for now here is a shortend</p><p>version.</p><p></p><p>Size,prep and weight sort all the brass,pick the bullet you want to</p><p>use and select two or three loads (primer,powder and weight of </p><p>powder) seat the bullets .020 or more off the lands (you change this</p><p>later) and start testing through a chonograph.</p><p></p><p>Look for low standard deviations and if the first and second shots</p><p>are way apart then stop and save the other rounds for later reloading.</p><p>dont worry about group size at this time ( this will happen later).</p><p></p><p>Once you find a load with good SD,s then you can change bullet styles</p><p>(not weight)and seating depth to improve group size.</p><p></p><p>Now instead of loading hundreds of loads looking for the best I can </p><p>normaly find the right one in less than 20 or 25 test.</p><p></p><p>As you can tell by the post there are a lot of opinions on this subject</p><p>and if it works for them then great. this is just the way I do it and with </p><p>the cost of components 'less is more'.</p><p></p><p>By the way after I started using this method I went back and tested</p><p>all of my best loads for SD and found them all to have very low SD,s</p><p>many were in the single digits (best was a 1000yrd load @04 in 5 rounds.</p><p></p><p>And not to stir the pot but "My Opinion" about a bullet straightning out </p><p>once it leaves the barrel is that a bullet has no brain and does not </p><p>correct it,s flight .If it starts out 1" to the left it will only get worse</p><p>due to outside forces (Wind,temp,humidity.altitude ETC) in a vacuum</p><p>if it starded out 1" to the left @ 100yrds it would be 2"left @ 200 and </p><p>10"@ 1000yrds so the best way to keep the accuracy at long distances</p><p>is to use bullets with the highest balistic coefficient that resist these out</p><p>side effects.</p><p></p><p>This gets us back to Standard deviations. One thing that can be improved</p><p>by carefull loading and has a huge effect on long range shooting is the</p><p>standard deviations.</p><p></p><p>I know it sounds like If you use a chronograph you are a Techno freak </p><p>(A quote from a famous poster on this site) Ha, Ha, But we enjoy all</p><p>of the other improvements that are out there that are to many to list</p><p>so why not utilizes the Chronograph to its fullest.</p><p></p><p></p><p>Sorry for the Essay just trying to help</p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 188832, member: 2736"] KQguy Lots of good information from everyone but maybe a little confusing so I thought I,d re,post from a different perspective to help you out. A looooong time ago there were no chronographs and all loads were tested for group size at the max distance to be used. If you shot High Power matches (200yrds, 300yrds, 600yrds and 1000 yrds)you worked up loads that would work best at 600yrds and 1000 yrds that may not be the same. some would have loads for 200 and 300yrds also. Back then it was not unusual to test several hundred loads to find just the right load for the task (targets or hunting). And then along came the chonograph that the average person could afford and changed the way a lot of people approached reloading. I made all of the usual mistakes because in the beginning all I was interested in was velocity. And I was still testing lots of loads. Then I read an article written by a bench rest shooter, Well I,m no bench rester but I can allways learn something new on how to work up accurace loads with a minimum of loading. I have posted this process before and will try to find it but for now here is a shortend version. Size,prep and weight sort all the brass,pick the bullet you want to use and select two or three loads (primer,powder and weight of powder) seat the bullets .020 or more off the lands (you change this later) and start testing through a chonograph. Look for low standard deviations and if the first and second shots are way apart then stop and save the other rounds for later reloading. dont worry about group size at this time ( this will happen later). Once you find a load with good SD,s then you can change bullet styles (not weight)and seating depth to improve group size. Now instead of loading hundreds of loads looking for the best I can normaly find the right one in less than 20 or 25 test. As you can tell by the post there are a lot of opinions on this subject and if it works for them then great. this is just the way I do it and with the cost of components 'less is more'. By the way after I started using this method I went back and tested all of my best loads for SD and found them all to have very low SD,s many were in the single digits (best was a 1000yrd load @04 in 5 rounds. And not to stir the pot but "My Opinion" about a bullet straightning out once it leaves the barrel is that a bullet has no brain and does not correct it,s flight .If it starts out 1" to the left it will only get worse due to outside forces (Wind,temp,humidity.altitude ETC) in a vacuum if it starded out 1" to the left @ 100yrds it would be 2"left @ 200 and 10"@ 1000yrds so the best way to keep the accuracy at long distances is to use bullets with the highest balistic coefficient that resist these out side effects. This gets us back to Standard deviations. One thing that can be improved by carefull loading and has a huge effect on long range shooting is the standard deviations. I know it sounds like If you use a chronograph you are a Techno freak (A quote from a famous poster on this site) Ha, Ha, But we enjoy all of the other improvements that are out there that are to many to list so why not utilizes the Chronograph to its fullest. Sorry for the Essay just trying to help J E CUSTOM [/QUOTE]
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