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Applied Ballistics for LR shooting ??s
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<blockquote data-quote="BryanLitz" data-source="post: 298415" data-attributes="member: 7848"><p>Regarding dispersion, </p><p>It's a maddening fact but there will always be some variation from shot-to-shot that will induce dispersion that's outside our control as shooters. Some examples of 'unavoidable' sources of dispersion include:</p><p>Atmosphere (wind)</p><p>MV variation</p><p>sighting error (you can only resolve the aim point with a limited amount of certainty)</p><p>bullet imperfections</p><p>loaded ammo imperfections/misalignment</p><p>variations in how the rifle is supported during recoil</p><p>muzzle blast effects (launch dynamics)</p><p></p><p>All of the above variations will have some amount of random uncertainty, whether you can measure it or not. Shooting 10" groups at 1000 yards is crazy, crazy good in light of all the variables involved. Still, BR shooters routinely shoot under 10" groups by tightening everything up even more and using heavier rifles to further dampen the harmonics of recoil.</p><p></p><p>The best way to understand your individual components of dispersion is experimentation. Just start systematically changing one variable at a time and noting the effect on group size. When you've converged on the combination that produces the least dispersion with a given rifle, then you know that any remaining dispersion is unavoidable.</p><p></p><p>As a matter of practical consideration, I recommend setting a reasonable dispersion goal depending on your equipment. For example, if you're shooting a light weight factory rifle, try getting it within 1 or 1.25 MOA. Once you've achieved that, rather than burning up the rest of the barrel life doing endless experiments to shave of a fraction of dispersion, go out and practice with it. The dispersion is a known quantity, so you can use that knowledge to limit your shots to a given range. Concentrate on maximizing your effectiveness within that range.</p><p></p><p>If your rifle is a top of the line custom, maybe you can realistically expect 1/2 MOA. Once you've achieved that, <u>finalize the load and practice with it</u>, especially at long range! This policy will make you a more effective LR shooter/hunter than making dozens of trips to the 100 yard range trying to make a .5 MOA rifle shoot .4 MOA then going hunting with your .4 MOA rifle and taking your first long shot at an animal. You might have a false confidence in your a .4 MOA rifle, but if you haven't practiced at long range, I don't like your chances.</p><p></p><p>So that's how I view dispersion. BR shooters live and die by dispersion, so they're always changing things trying to minimize it. As a practical shooter, I say KNOW the dispersion of your equipment, accept it, and practice with it.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 298415, member: 7848"] Regarding dispersion, It's a maddening fact but there will always be some variation from shot-to-shot that will induce dispersion that's outside our control as shooters. Some examples of 'unavoidable' sources of dispersion include: Atmosphere (wind) MV variation sighting error (you can only resolve the aim point with a limited amount of certainty) bullet imperfections loaded ammo imperfections/misalignment variations in how the rifle is supported during recoil muzzle blast effects (launch dynamics) All of the above variations will have some amount of random uncertainty, whether you can measure it or not. Shooting 10" groups at 1000 yards is crazy, crazy good in light of all the variables involved. Still, BR shooters routinely shoot under 10" groups by tightening everything up even more and using heavier rifles to further dampen the harmonics of recoil. The best way to understand your individual components of dispersion is experimentation. Just start systematically changing one variable at a time and noting the effect on group size. When you've converged on the combination that produces the least dispersion with a given rifle, then you know that any remaining dispersion is unavoidable. As a matter of practical consideration, I recommend setting a reasonable dispersion goal depending on your equipment. For example, if you're shooting a light weight factory rifle, try getting it within 1 or 1.25 MOA. Once you've achieved that, rather than burning up the rest of the barrel life doing endless experiments to shave of a fraction of dispersion, go out and practice with it. The dispersion is a known quantity, so you can use that knowledge to limit your shots to a given range. Concentrate on maximizing your effectiveness within that range. If your rifle is a top of the line custom, maybe you can realistically expect 1/2 MOA. Once you've achieved that, [U]finalize the load and practice with it[/U], especially at long range! This policy will make you a more effective LR shooter/hunter than making dozens of trips to the 100 yard range trying to make a .5 MOA rifle shoot .4 MOA then going hunting with your .4 MOA rifle and taking your first long shot at an animal. You might have a false confidence in your a .4 MOA rifle, but if you haven't practiced at long range, I don't like your chances. So that's how I view dispersion. BR shooters live and die by dispersion, so they're always changing things trying to minimize it. As a practical shooter, I say KNOW the dispersion of your equipment, accept it, and practice with it. -Bryan [/QUOTE]
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