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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chronographs: What to do?
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<blockquote data-quote="nvschütze" data-source="post: 1798915" data-attributes="member: 110896"><p>I'm giving you two thumbs-up for that one! The SD is a number that tells you how similar are the velocities in the population. If it's low (less than 30 fps out of 3000 fps; 1%), that ammo is very predictable. If it's high (three to four percent), the ammo is not very consistent and will show that on the target. I should think you'd get high SDs when the charge is both too high and too low.</p></blockquote><p></p>
[QUOTE="nvschütze, post: 1798915, member: 110896"] I'm giving you two thumbs-up for that one! The SD is a number that tells you how similar are the velocities in the population. If it's low (less than 30 fps out of 3000 fps; 1%), that ammo is very predictable. If it's high (three to four percent), the ammo is not very consistent and will show that on the target. I should think you'd get high SDs when the charge is both too high and too low. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chronographs: What to do?
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