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Rifles, Reloading, Optics, Equipment
Reloading
5 or 3 shot group when determining ES/SD???
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<blockquote data-quote="J E Custom" data-source="post: 625697" data-attributes="member: 2736"><p>I think you have it now.</p><p></p><p>There is always a progression to any problem and In my opinion using a chronograph is the best </p><p>way to start working up a load.</p><p></p><p>The number of shots used is determined by the results of each load tested.</p><p></p><p>I have seen great SDs and poor accuracy. And great accuracy and poor SDs (At shorter ranges)</p><p></p><p>Using the chronograph saves time and barrel life because you can narrow a potential load down</p><p>without excessive /Wasted shots.</p><p></p><p>I like to load 5 rounds of each load to be tested, Start with a clean barrel with each load, shoot</p><p>2 rounds through the chronograph and check the SDs. If the spread is to high for the intended</p><p>use (Long rang or short range) I abandon the load and move on to the next load.</p><p></p><p>If the SDs are what I consider good on one of the test loads I continue shooting all 5 or until</p><p>one round is excessive. I keep "ALL" information even the bad loads so that I don't duplicate </p><p>them in later testing.</p><p></p><p>After finding several good SD loads I then start shooting at the intended range to see if it is </p><p>accurate at the range desired or needed.</p><p></p><p>Good SDs Tells you that you have a good powder,primer,bullet weight combination. (It does </p><p>not tell you that you have an accurate load only range testing will tell you that.</p><p></p><p>Some times a barrel just does not like a particular bullet and you have to change to a different</p><p>style or make. As long as you keep the weight the same the SDs should remain close to what</p><p>they were (There is exceptions to everything).</p><p></p><p>The main reason for finding low SDs is for long range shooting where 10 to 15 ft/sec velocity</p><p>difference will cause virtical stringing. for shooting 4 to 500 yards or less accuracy and consistency</p><p>is more important because 15 ft/sec does noe change the POI that much.</p><p></p><p>If you test accuracy only and find a good load for all distance or the longest distance to be shot</p><p>you will find it has a good SD. So which came first, the chicken or the egg.</p><p></p><p>I tried the accuracy route first and spent lots of time and money on a hit and miss method and </p><p>when I started using the chronograph it reduced the number of test firings 75% in order to find</p><p>the best load for a particular rifle and use.</p><p></p><p>So I guess my answer would be 2 to 10 because if you haven't found an accurate load after 10</p><p>shots you are wasting your time and Barrel.</p><p></p><p>Just My Opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 625697, member: 2736"] I think you have it now. There is always a progression to any problem and In my opinion using a chronograph is the best way to start working up a load. The number of shots used is determined by the results of each load tested. I have seen great SDs and poor accuracy. And great accuracy and poor SDs (At shorter ranges) Using the chronograph saves time and barrel life because you can narrow a potential load down without excessive /Wasted shots. I like to load 5 rounds of each load to be tested, Start with a clean barrel with each load, shoot 2 rounds through the chronograph and check the SDs. If the spread is to high for the intended use (Long rang or short range) I abandon the load and move on to the next load. If the SDs are what I consider good on one of the test loads I continue shooting all 5 or until one round is excessive. I keep "ALL" information even the bad loads so that I don't duplicate them in later testing. After finding several good SD loads I then start shooting at the intended range to see if it is accurate at the range desired or needed. Good SDs Tells you that you have a good powder,primer,bullet weight combination. (It does not tell you that you have an accurate load only range testing will tell you that. Some times a barrel just does not like a particular bullet and you have to change to a different style or make. As long as you keep the weight the same the SDs should remain close to what they were (There is exceptions to everything). The main reason for finding low SDs is for long range shooting where 10 to 15 ft/sec velocity difference will cause virtical stringing. for shooting 4 to 500 yards or less accuracy and consistency is more important because 15 ft/sec does noe change the POI that much. If you test accuracy only and find a good load for all distance or the longest distance to be shot you will find it has a good SD. So which came first, the chicken or the egg. I tried the accuracy route first and spent lots of time and money on a hit and miss method and when I started using the chronograph it reduced the number of test firings 75% in order to find the best load for a particular rifle and use. So I guess my answer would be 2 to 10 because if you haven't found an accurate load after 10 shots you are wasting your time and Barrel. Just My Opinion J E CUSTOM [/QUOTE]
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5 or 3 shot group when determining ES/SD???
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