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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What “Causes” a Low SD/ES?
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<blockquote data-quote="Pro2A" data-source="post: 2260723" data-attributes="member: 17889"><p>Percentage of powder volume fill; high angle shooting......up versus down versus level.... with excess powder void shifting versus compressed powder loads; temperature variations.....rounds laying in sun versus shade. Rounds in gun at 0F versus rounds inside your parka at 98.6F. Even heavy vibration in ammo transport can contribute to powder packing/shift and ignition/burn variables. Throw your packed up ammo in a pickup bed, some ammo horizontal;some vertical; tip up/down, and drive 25 miles up a rocky rutted washboard road....powder may compact more/differently. So many variables and combinations of variables impact ignition/burn characteristics and thus SD/ES. As FEENIX stated....Consistency is crucial. CONSISTENCY is King...in reloading techniques, ammo handling, every phase of precision, extended range shooting.</p></blockquote><p></p>
[QUOTE="Pro2A, post: 2260723, member: 17889"] Percentage of powder volume fill; high angle shooting......up versus down versus level.... with excess powder void shifting versus compressed powder loads; temperature variations.....rounds laying in sun versus shade. Rounds in gun at 0F versus rounds inside your parka at 98.6F. Even heavy vibration in ammo transport can contribute to powder packing/shift and ignition/burn variables. Throw your packed up ammo in a pickup bed, some ammo horizontal;some vertical; tip up/down, and drive 25 miles up a rocky rutted washboard road....powder may compact more/differently. So many variables and combinations of variables impact ignition/burn characteristics and thus SD/ES. As FEENIX stated....Consistency is crucial. CONSISTENCY is King...in reloading techniques, ammo handling, every phase of precision, extended range shooting. [/QUOTE]
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What “Causes” a Low SD/ES?
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