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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help with BC calculation
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<blockquote data-quote="Jeff In TX" data-source="post: 35218" data-attributes="member: 1522"><p>No matter what ballistic calculation you use, he has really no mathematical ballistic curve for his results. His bullet begins to descend at very abnormal rates according to his yardage. Its slows at one range and one rate, then the bullet almost stops descending, the it slows again and then between 700 and 800 yards it really starts to die. </p><p></p><p>The only logical explanation if his velocity was correct, his range markers were really off. Here are two examples. The first with his 140 gr SST bullet at 3200 fps which gave me a close reading to his 300 and 800 yard results. The second is at 2975 and should resemble a more normal ballistic curve for his bullet</p><p></p><p>Yards * Your results * ballistic program results using a velocity of 3200 fps</p><p>300 * 2.5 * 2.41</p><p>400 * 4.0 * 4.4 </p><p>500 * 6.0 * 6.6 </p><p>600 * 8.0 * 9.2 </p><p>700 * 11.0 * 12.0 </p><p>800 * 15.0 * 15.17 </p><p></p><p>If your velocity was really 2975 your actual ranges would more likely be</p><p>Yards * Your results</p><p>275 * 2.5</p><p>345 * 4.0</p><p>425 * 6.0</p><p>500 * 8.0</p><p>600 * 11.0</p><p>715 * 15.0</p><p>800 * 19.10</p><p>900 * 23.01</p><p></p><p>[ 08-20-2004: Message edited by: Jeff In TX ]</p></blockquote><p></p>
[QUOTE="Jeff In TX, post: 35218, member: 1522"] No matter what ballistic calculation you use, he has really no mathematical ballistic curve for his results. His bullet begins to descend at very abnormal rates according to his yardage. Its slows at one range and one rate, then the bullet almost stops descending, the it slows again and then between 700 and 800 yards it really starts to die. The only logical explanation if his velocity was correct, his range markers were really off. Here are two examples. The first with his 140 gr SST bullet at 3200 fps which gave me a close reading to his 300 and 800 yard results. The second is at 2975 and should resemble a more normal ballistic curve for his bullet Yards * Your results * ballistic program results using a velocity of 3200 fps 300 * 2.5 * 2.41 400 * 4.0 * 4.4 500 * 6.0 * 6.6 600 * 8.0 * 9.2 700 * 11.0 * 12.0 800 * 15.0 * 15.17 If your velocity was really 2975 your actual ranges would more likely be Yards * Your results 275 * 2.5 345 * 4.0 425 * 6.0 500 * 8.0 600 * 11.0 715 * 15.0 800 * 19.10 900 * 23.01 [ 08-20-2004: Message edited by: Jeff In TX ] [/QUOTE]
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Help with BC calculation
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