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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Effects of atmospheric pressure on bullet drop at long range.
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<blockquote data-quote="vancewalker007" data-source="post: 2345621" data-attributes="member: 66917"><p>So glad you got your elk.</p><p></p><p>Its obvious you shot high. I think the .25-.5 MOA error you had from using line-of-sight range instead of true-ballistic range plus your rifle's accuracy factor (I'd assume 1 MOA for the purpose of this) you could be dealing with 3-4 inches of height error. Maybe more if your ES and SD are over 20fps.</p><p></p><p>You were shooting off a setup that was different from your practice setup in particular you had no rear bag. You're an American, so am I ;-), we tend to aim high as a group to begin with (that's an assumption). Lets say this could cause another 2-3 inches or error.</p><p></p><p>So worst case in my example you may have induced around 7 inches of error plus aiming a little high you could easily be inducing 1.2 MOA of error at 590ish yards.</p><p></p><p>I don't think you enviro data effected your shot very much compared to the other possible errors. Another subtle effect can be wind across broken terrain. If there were any up drafts between you and the elk that could have added to the error.</p><p></p><p>What to do to avoid this in future:</p><p>1. Practice shoot long range off your field set ups at angles. Its hard if you live in flat land. Maybe you could find a deer stand to shoot out of?</p><p>2. Get yourself a set of light weight shooting bags so you can anchor the rear of your rifle - We use Phoenix Shooting bags.</p><p>3. Make sure you are always using true ballistic range, at all times, for doping a shot.</p><p></p><p>Man I gotta go shoot some steel.</p></blockquote><p></p>
[QUOTE="vancewalker007, post: 2345621, member: 66917"] So glad you got your elk. Its obvious you shot high. I think the .25-.5 MOA error you had from using line-of-sight range instead of true-ballistic range plus your rifle's accuracy factor (I'd assume 1 MOA for the purpose of this) you could be dealing with 3-4 inches of height error. Maybe more if your ES and SD are over 20fps. You were shooting off a setup that was different from your practice setup in particular you had no rear bag. You're an American, so am I ;-), we tend to aim high as a group to begin with (that's an assumption). Lets say this could cause another 2-3 inches or error. So worst case in my example you may have induced around 7 inches of error plus aiming a little high you could easily be inducing 1.2 MOA of error at 590ish yards. I don't think you enviro data effected your shot very much compared to the other possible errors. Another subtle effect can be wind across broken terrain. If there were any up drafts between you and the elk that could have added to the error. What to do to avoid this in future: 1. Practice shoot long range off your field set ups at angles. Its hard if you live in flat land. Maybe you could find a deer stand to shoot out of? 2. Get yourself a set of light weight shooting bags so you can anchor the rear of your rifle - We use Phoenix Shooting bags. 3. Make sure you are always using true ballistic range, at all times, for doping a shot. Man I gotta go shoot some steel. [/QUOTE]
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Effects of atmospheric pressure on bullet drop at long range.
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