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Long Range Hunting & Shooting
Heavier bullets for smaller callibers
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<blockquote data-quote="Beluebow" data-source="post: 2502045" data-attributes="member: 3246"><p>Perfect timing....Bryan Litz just posted this on FB.....quoted...</p><p></p><p>"A heavier, higher BC bullet will have a lower MV than a lighter one (same gun/cartridge/pressure) and usually a longer time of flight. But it's deflected less by the wind because it has less lag time.</p><p>Lag time is defined as the difference between the actual time of flight and the vacuum time of flight. Actual time of flight you get from a ballistics program, vacuum time of flight would be the time of flight if the bullet didn't lose any speed.</p><p>For example, a bullet with a muzzle velocity of 3,000 ft per second that travels a thousand yards would have a vacuum time of flight of 1 second (3000 feet at 3000 feet per second). If that bullet had an actual time of flight of 1.528 seconds, the lag time is 0.528 seconds.</p><p>Once you have lag time, you can calculate wind deflection. In a 10 mph (14.7 fps) crosswind, the deflection is: 14.7 ft/s times 0.528 s = 7.74 ft = 93 inches.</p><p>As you go to heavier bullets with lower muzzle velocity, the total time of flight grows but the lag time compresses. Therefore, less wind deflection.</p><p>Caveat; this assumes the light & heavy bullets are similar shape (form factor)."</p><p></p><p>[ATTACH=full]357522[/ATTACH]</p><p><img src="https://static.xx.fbcdn.net/images/emoji.php/v9/te4/1.5/16/26a1.png" alt="⚡" class="fr-fic fr-dii fr-draggable " style="" /><img src="https://static.xx.fbcdn.net/images/emoji.php/v9/te4/1.5/16/26a1.png" alt="⚡" class="fr-fic fr-dii fr-draggable " style="" /><img src="https://static.xx.fbcdn.net/images/emoji.php/v9/te4/1.5/16/26a1.png" alt="⚡" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Beluebow, post: 2502045, member: 3246"] Perfect timing....Bryan Litz just posted this on FB.....quoted... "A heavier, higher BC bullet will have a lower MV than a lighter one (same gun/cartridge/pressure) and usually a longer time of flight. But it's deflected less by the wind because it has less lag time. Lag time is defined as the difference between the actual time of flight and the vacuum time of flight. Actual time of flight you get from a ballistics program, vacuum time of flight would be the time of flight if the bullet didn't lose any speed. For example, a bullet with a muzzle velocity of 3,000 ft per second that travels a thousand yards would have a vacuum time of flight of 1 second (3000 feet at 3000 feet per second). If that bullet had an actual time of flight of 1.528 seconds, the lag time is 0.528 seconds. Once you have lag time, you can calculate wind deflection. In a 10 mph (14.7 fps) crosswind, the deflection is: 14.7 ft/s times 0.528 s = 7.74 ft = 93 inches. As you go to heavier bullets with lower muzzle velocity, the total time of flight grows but the lag time compresses. Therefore, less wind deflection. Caveat; this assumes the light & heavy bullets are similar shape (form factor)." [ATTACH type="full"]357522[/ATTACH] [IMG alt="⚡"]https://static.xx.fbcdn.net/images/emoji.php/v9/te4/1.5/16/26a1.png[/IMG][IMG alt="⚡"]https://static.xx.fbcdn.net/images/emoji.php/v9/te4/1.5/16/26a1.png[/IMG][IMG alt="⚡"]https://static.xx.fbcdn.net/images/emoji.php/v9/te4/1.5/16/26a1.png[/IMG] [/QUOTE]
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