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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Advanced Ballistics Questions Regarding Sean Kennedy's Shooter Program
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<blockquote data-quote="RockyMtnHigh" data-source="post: 840196" data-attributes="member: 41215"><p>I feel like there is just too much potential for shooter error when we are talking about such small numbers. Even with a lead sled I can't accurately replicate those shots, and I understand you're point about shooting a whole group and maybe looking at an average.</p><p></p><p>I think I may have unlocked part of the puzzle. In <em>Shooter</em>, when you use a Bryan Litz bullet profile, it is only populating the average ballistic coefficient for that particular load. For my bullet, the G7 BC is 0.246, which is what he publishes as the average BC on page 509 of his book <em>Applied Ballistics for Long Range Shooting</em>, but if you look at the data he presents he provides a list of BCs for this bullet based on a minimum muzzle velocity. Regardless of temperature and pressure, I have never recorded a muzzle velocity less than 3,000 fps. According to his data, my bullet has a G7 ballistic coefficient of 0.253 instead of 0.246. When I input this BC into <em>Shooter</em> my solution changes nominally, but in the right direction.</p><p></p><p>I understand the need to check my click values, but can anyone weigh in on the muzzle velocity issue / question?</p></blockquote><p></p>
[QUOTE="RockyMtnHigh, post: 840196, member: 41215"] I feel like there is just too much potential for shooter error when we are talking about such small numbers. Even with a lead sled I can't accurately replicate those shots, and I understand you're point about shooting a whole group and maybe looking at an average. I think I may have unlocked part of the puzzle. In [I]Shooter[/I], when you use a Bryan Litz bullet profile, it is only populating the average ballistic coefficient for that particular load. For my bullet, the G7 BC is 0.246, which is what he publishes as the average BC on page 509 of his book [I]Applied Ballistics for Long Range Shooting[/I], but if you look at the data he presents he provides a list of BCs for this bullet based on a minimum muzzle velocity. Regardless of temperature and pressure, I have never recorded a muzzle velocity less than 3,000 fps. According to his data, my bullet has a G7 ballistic coefficient of 0.253 instead of 0.246. When I input this BC into [I]Shooter[/I] my solution changes nominally, but in the right direction. I understand the need to check my click values, but can anyone weigh in on the muzzle velocity issue / question? [/QUOTE]
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Advanced Ballistics Questions Regarding Sean Kennedy's Shooter Program
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