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Long Range Hunting & Shooting
MOA at 400 but can't get on target at 650?
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<blockquote data-quote="Chase723" data-source="post: 1716932" data-attributes="member: 21524"><p>Couple things...probably already answered in the thread but here's my .02 to join the lot.</p><p></p><p>Things change pretty drastically between 400 and 600 yards. You go from short range to medium range and environmental factors and shooter error become increasingly more important. </p><p></p><p>1) the group you posted is 1/2 MOA high and right at 100 yards. At 600, even if everything is perfect, you're going to be off center by at least 3 inches.</p><p></p><p>2) if there was even a 3mph wind, which is barely perceptible, with that bullet at that distance you'll be off by ~0.3 mils, or ~1 MOA. So now w/ the above you're 9 inches off target before you even start. </p><p></p><p>3) you're ammunition likely has an ES > 30, probably like 50-80. If that's the case, at that distance, then you'll have an additional 3 inches or so of random dispersion. I.e. a ~1/2 MOA of precision out the window. So now you're at least 12 inches off at 600. That 1/2 MOA at 100 is now 2 MOA at 600. Since if we make the assumption that you're a perfect shooter, and your load opened up by 1/2 MOA from 100-400 yards, that's actually quite a bit. If you're ES was less than 30 than it should be ~ 3/4". </p><p></p><p>Common Shooter errors</p><p></p><p>4) Paralax is off/head position behind the scope varies between shots. At 600 that can easily be 1/2- 1 MOA different. So now you're 3 MOA at 600.</p><p></p><p>5) Inconsistent trigger pull/flinching. Add another 1/2-1 MOA. Now you're 4 MOA at 600.</p></blockquote><p></p>
[QUOTE="Chase723, post: 1716932, member: 21524"] Couple things...probably already answered in the thread but here’s my .02 to join the lot. Things change pretty drastically between 400 and 600 yards. You go from short range to medium range and environmental factors and shooter error become increasingly more important. 1) the group you posted is 1/2 MOA high and right at 100 yards. At 600, even if everything is perfect, you’re going to be off center by at least 3 inches. 2) if there was even a 3mph wind, which is barely perceptible, with that bullet at that distance you’ll be off by ~0.3 mils, or ~1 MOA. So now w/ the above you’re 9 inches off target before you even start. 3) you’re ammunition likely has an ES > 30, probably like 50-80. If that’s the case, at that distance, then you’ll have an additional 3 inches or so of random dispersion. I.e. a ~1/2 MOA of precision out the window. So now you’re at least 12 inches off at 600. That 1/2 MOA at 100 is now 2 MOA at 600. Since if we make the assumption that you’re a perfect shooter, and your load opened up by 1/2 MOA from 100-400 yards, that’s actually quite a bit. If you’re ES was less than 30 than it should be ~ 3/4”. Common Shooter errors 4) Paralax is off/head position behind the scope varies between shots. At 600 that can easily be 1/2- 1 MOA different. So now you’re 3 MOA at 600. 5) Inconsistent trigger pull/flinching. Add another 1/2-1 MOA. Now you’re 4 MOA at 600. [/QUOTE]
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MOA at 400 but can't get on target at 650?
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