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Rifles, Reloading, Optics, Equipment
Reloading
Top three things to reduce ES and SD
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<blockquote data-quote="Hondo64d" data-source="post: 2256375" data-attributes="member: 1390"><p>Use uniform brass. I buy brass that I will be confident in its uniformity as it comes from the factory. I don't weigh brass or turn necks. So, I use Alpha or Lapua.</p><p></p><p>Weigh every charge as accurately as you can. I use a Lyman M5 scale and can literally see one kernel of powder move the pointer.</p><p></p><p>Pick a sizing method that gives you low runout, and uniform sizing. I use a honed Forster FL sizer Adjusted to bump my shoulders .002".</p><p></p><p>Annealing. I anneal prior to every resizing. I get a little more consistent shoulder bump by doing so.</p><p></p><p>Even though I do all this, I seldom use a chronograph anymore. Most folks preach small ES or SD but don't use enough data points (shots) to provide a high level of confidence in those numbers. As I understand it, it takes about 30 shots to give a statistically valid SD. I often see folks publish their SDs for three or five shots and it makes me chuckle to myself. The same goes for a pic of single three or five shot group on a target but that's another topic. In the end, all that really matters is what happens on the target. If I get consistently small vertical spreads at the ranges I shoot, I'm happy.</p><p></p><p>John</p></blockquote><p></p>
[QUOTE="Hondo64d, post: 2256375, member: 1390"] Use uniform brass. I buy brass that I will be confident in its uniformity as it comes from the factory. I don’t weigh brass or turn necks. So, I use Alpha or Lapua. Weigh every charge as accurately as you can. I use a Lyman M5 scale and can literally see one kernel of powder move the pointer. Pick a sizing method that gives you low runout, and uniform sizing. I use a honed Forster FL sizer Adjusted to bump my shoulders .002”. Annealing. I anneal prior to every resizing. I get a little more consistent shoulder bump by doing so. Even though I do all this, I seldom use a chronograph anymore. Most folks preach small ES or SD but don’t use enough data points (shots) to provide a high level of confidence in those numbers. As I understand it, it takes about 30 shots to give a statistically valid SD. I often see folks publish their SDs for three or five shots and it makes me chuckle to myself. The same goes for a pic of single three or five shot group on a target but that’s another topic. In the end, all that really matters is what happens on the target. If I get consistently small vertical spreads at the ranges I shoot, I’m happy. John [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Top three things to reduce ES and SD
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