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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What keeps a round from holding MOA
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<blockquote data-quote="Mysticplayer" data-source="post: 36661" data-attributes="member: 8947"><p>Straydog, I would suggest you play with a ballistics program and see how much effect wind can have on your bullet.</p><p></p><p>At 400yds, you are trying to stay within a 4" group. However, a small variation in wind/conditions can move your bullet a few inches. Throw in a bit of shooter oops and voila, big groups.</p><p></p><p>With low power scopes, the reticle covers so much of your target that you can be off by an inch just by scope error alone. With scopes of poor resolution, it is hard to know where to put the blurr. Add that to all the other factors and I think you just solved your problem.</p><p></p><p>When I develop my LR loads I do it at 180 to 250yds. That's just the distance of my range but far enough to show if a load works or not. Wind is not a big factor and with some wind flags on calm days, I can predict which is gun or conditions.</p><p></p><p>I use a scope that allows me to see 1/16" at that range. Now I know where I am aiming.</p><p></p><p>I then take that load and start shooting at ranges out to 750yds at known rocks. With my earlier suggestions of better components including match primers, the shots are within the mechanical accuracy of the rifle, taking wind into account.</p><p></p><p>If I start spraying, I can usually find a load related problem or not reading the wind well enough. A good bullet launched straight, stays straight until mother nature moves it.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 36661, member: 8947"] Straydog, I would suggest you play with a ballistics program and see how much effect wind can have on your bullet. At 400yds, you are trying to stay within a 4" group. However, a small variation in wind/conditions can move your bullet a few inches. Throw in a bit of shooter oops and voila, big groups. With low power scopes, the reticle covers so much of your target that you can be off by an inch just by scope error alone. With scopes of poor resolution, it is hard to know where to put the blurr. Add that to all the other factors and I think you just solved your problem. When I develop my LR loads I do it at 180 to 250yds. That's just the distance of my range but far enough to show if a load works or not. Wind is not a big factor and with some wind flags on calm days, I can predict which is gun or conditions. I use a scope that allows me to see 1/16" at that range. Now I know where I am aiming. I then take that load and start shooting at ranges out to 750yds at known rocks. With my earlier suggestions of better components including match primers, the shots are within the mechanical accuracy of the rifle, taking wind into account. If I start spraying, I can usually find a load related problem or not reading the wind well enough. A good bullet launched straight, stays straight until mother nature moves it. Jerry [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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What keeps a round from holding MOA
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