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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
true bc of barnes 180 tsx?
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<blockquote data-quote="chris matthews" data-source="post: 35374" data-attributes="member: 66"><p>Something you guys are forgetting here- the BC changes constantly with velocity. That's why you get a lower BC with the added distance. It probably started out near the advertised BC (most companies are optimistic about their BCs) and then the first range you shot (600) the bullet maintained enough velocity to keep a higher BC then over the next 365 yards out to the final disatnce of 965 the velocity dropped off enough to lower the BC even further.</p><p>Look at Sierra's website and you'll notice they give three BCs for every bullet.</p><p>The only way you are going to get a true BC is to shoot it over a chronograph at the muzzle and at say 100,300, 600 and 1000. Then you can get an accurate BC. The "reverse engineering" method you are using will give you an estimate but is tough unless you know velocity.</p></blockquote><p></p>
[QUOTE="chris matthews, post: 35374, member: 66"] Something you guys are forgetting here- the BC changes constantly with velocity. That's why you get a lower BC with the added distance. It probably started out near the advertised BC (most companies are optimistic about their BCs) and then the first range you shot (600) the bullet maintained enough velocity to keep a higher BC then over the next 365 yards out to the final disatnce of 965 the velocity dropped off enough to lower the BC even further. Look at Sierra's website and you'll notice they give three BCs for every bullet. The only way you are going to get a true BC is to shoot it over a chronograph at the muzzle and at say 100,300, 600 and 1000. Then you can get an accurate BC. The "reverse engineering" method you are using will give you an estimate but is tough unless you know velocity. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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true bc of barnes 180 tsx?
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