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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="desertcrr1" data-source="post: 1717064" data-attributes="member: 92146"><p>There are all kinds of things that begin to affect accuracy at about 650 yards, but you have most of them covered. One of them not discussed so far is the accuracy of ranging. If you look at the drop vs. range profile of almost any cartridge, this is the range at which the bullet is really starting to drop. If the range estimate is off just by a few feet a bullet can impact in front or behind a target that's not really tall from just a small variation in muzzle velocity with everything else perfect - which it never is. The nice even number of "650" when ranging to a rock might well cause a miss if it were 648 or 652. I don't know what the "ballistic calculator" in your RF uses but I would also encourage checking it against Hornady's 4DOF just to see. Also, chronograph at least 10 rounds, compute a SD and a 5 or 10% max and min V0. Plug these two extremes into 4dof and get the poi elevation extremes at 650 and compare with the height of the rock. This will tell you the precision needed to hit that rock.</p></blockquote><p></p>
[QUOTE="desertcrr1, post: 1717064, member: 92146"] There are all kinds of things that begin to affect accuracy at about 650 yards, but you have most of them covered. One of them not discussed so far is the accuracy of ranging. If you look at the drop vs. range profile of almost any cartridge, this is the range at which the bullet is really starting to drop. If the range estimate is off just by a few feet a bullet can impact in front or behind a target that's not really tall from just a small variation in muzzle velocity with everything else perfect - which it never is. The nice even number of "650" when ranging to a rock might well cause a miss if it were 648 or 652. I don't know what the "ballistic calculator" in your RF uses but I would also encourage checking it against Hornady's 4DOF just to see. Also, chronograph at least 10 rounds, compute a SD and a 5 or 10% max and min V0. Plug these two extremes into 4dof and get the poi elevation extremes at 650 and compare with the height of the rock. This will tell you the precision needed to hit that rock. [/QUOTE]
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MOA at 400 but can't get on target at 650?
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