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Rifles, Reloading, Optics, Equipment
Reloading
Standard deviation in .223 Rem
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<blockquote data-quote="J E Custom" data-source="post: 293505" data-attributes="member: 2736"><p>Those are very good SDs !</p><p></p><p>It is the smaller bullets that are harder to get low SDs because of the weights of the bullets</p><p>compared to the velocity. </p><p></p><p>The smaller the bullet the more it is effected buy any difference in primers, neck tension, seating</p><p>depth, temperature and even the accuracy of the bullet weight . For example= If 500gr bullets</p><p>vary by 1/10 of a grain the difference will be 2/100 of 1 percent. but if 50gr bullets vary</p><p>by 1/10 of a grain then the percentage is 2/10 of 1 %.</p><p></p><p>It is not hard to get big bore bullets in the 400 to 600gr range down to single digits because slight differences have less effect on them.</p><p></p><p>The smaller cases do have an advantage in combustion Pressures because of faster powders </p><p>and smaller volume's . </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 293505, member: 2736"] Those are very good SDs ! It is the smaller bullets that are harder to get low SDs because of the weights of the bullets compared to the velocity. The smaller the bullet the more it is effected buy any difference in primers, neck tension, seating depth, temperature and even the accuracy of the bullet weight . For example= If 500gr bullets vary by 1/10 of a grain the difference will be 2/100 of 1 percent. but if 50gr bullets vary by 1/10 of a grain then the percentage is 2/10 of 1 %. It is not hard to get big bore bullets in the 400 to 600gr range down to single digits because slight differences have less effect on them. The smaller cases do have an advantage in combustion Pressures because of faster powders and smaller volume's . J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Standard deviation in .223 Rem
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