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Rifles, Reloading, Optics, Equipment
Reloading
NODES _ Ladder test
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<blockquote data-quote="Bart B" data-source="post: 1164556" data-attributes="member: 5302"><p>Sierra Bullets' software calculates the following bullet drop difference for charge weight increments at different ranges as shown assuming the bore axis is exactly the same angle above the horizontal for each shot:</p><p></p><p>6mm 100 gr. SBT @ 2850 fps, 3/10ths grain charge weight change of IMR4064 has a muzzle velocity change of 21.4 fps and the drop difference at:</p><p>200 yards = .150"</p><p>300 yards = .363"</p><p>400 yards = .699"</p><p>500 yards = 1.20"</p><p></p><p>7mm 160 gr. SBT @ 3050 fps, 5/10ths grain charge weight change of RL19 has a muzzle velocity change of 21.7 fps and the drop difference at: </p><p>200 yards = .120"</p><p>300 yards = .285"</p><p>400 yards = .530"</p><p>500 yards = .885"</p><p></p><p>What accuracy level does each load have to have at those ranges so a single shot from each load is meaningful in where it strikes in elevation?</p><p></p><p>What if that shot's the highest one in a group of several with that load? Or the lowest one?</p><p></p><p>I don't think one shot of a given load has any meaning down range unless that load's accuracy is no more than 1/3rd the drop difference in the lists above.</p><p></p><p>Can anyone explain why a single shot is statistically significant considering all the variables in the ammo, rifle and shooter cause bullets not to go into the same hole or vertical position at any range?</p><p></p><p>Has anyone repeated the same test to see if the same results are given?</p></blockquote><p></p>
[QUOTE="Bart B, post: 1164556, member: 5302"] Sierra Bullets’ software calculates the following bullet drop difference for charge weight increments at different ranges as shown assuming the bore axis is exactly the same angle above the horizontal for each shot: 6mm 100 gr. SBT @ 2850 fps, 3/10ths grain charge weight change of IMR4064 has a muzzle velocity change of 21.4 fps and the drop difference at: 200 yards = .150" 300 yards = .363" 400 yards = .699" 500 yards = 1.20" 7mm 160 gr. SBT @ 3050 fps, 5/10ths grain charge weight change of RL19 has a muzzle velocity change of 21.7 fps and the drop difference at: 200 yards = .120" 300 yards = .285" 400 yards = .530" 500 yards = .885" What accuracy level does each load have to have at those ranges so a single shot from each load is meaningful in where it strikes in elevation? What if that shot's the highest one in a group of several with that load? Or the lowest one? I don't think one shot of a given load has any meaning down range unless that load's accuracy is no more than 1/3rd the drop difference in the lists above. Can anyone explain why a single shot is statistically significant considering all the variables in the ammo, rifle and shooter cause bullets not to go into the same hole or vertical position at any range? Has anyone repeated the same test to see if the same results are given? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
NODES _ Ladder test
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