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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Importance of T.O.F.???
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<blockquote data-quote="Mikecr" data-source="post: 474365" data-attributes="member: 1521"><p>I think you're seeing it backwards. You can't predict TOF without BC, so why not just use BC?</p><p>And then there is the matter Kevin mentioned that TOF itself, is not a direct indicator of BC. If I shot a high BC slower, it's TOF would be higher from distance X to Y. So even if there were a 'standard' velocity and X&Y points on the box, if I'm launching them at another velocity(not standard), then I'm stuck interpolating, guessing, adjusting and testing as much as we must with BC!</p><p>I can't think of a real gain there..</p><p></p><p>There is another factor that would pull any nobel prize off from under your notion; TLAG</p><p>A ballistic system can have seperate attributes of drift-vs-drop for near wind -vs- far wind.</p><p>I think it could actually lead to two BCs assigned in the future(atleast for me).</p><p>Wind drift is tied to velocity loss RATE(this is not TOF). Low BC bullets launched at very high velocities(low TOF) loose velocity at a higher rate than high BC bullets launched at low velocities(hi TOF). Given this, near wind pushes the largest velocity drop rate(esp. w/lower BC bullet) to cause a greater angular error down range, than it would for the lower velocity loss rate bullet. </p><p>Most(not all) ballistic programs assume wind entry applies to the full bullet flight, but it's really the first couple hundred yards of wind that dominates results. It's the first couple hundred yards that a bullet's velocity loss rate is highest.</p><p></p><p>Anyway, it's fun to think about something that is new and different here</p></blockquote><p></p>
[QUOTE="Mikecr, post: 474365, member: 1521"] I think you're seeing it backwards. You can't predict TOF without BC, so why not just use BC? And then there is the matter Kevin mentioned that TOF itself, is not a direct indicator of BC. If I shot a high BC slower, it's TOF would be higher from distance X to Y. So even if there were a 'standard' velocity and X&Y points on the box, if I'm launching them at another velocity(not standard), then I'm stuck interpolating, guessing, adjusting and testing as much as we must with BC! I can't think of a real gain there.. There is another factor that would pull any nobel prize off from under your notion; TLAG A ballistic system can have seperate attributes of drift-vs-drop for near wind -vs- far wind. I think it could actually lead to two BCs assigned in the future(atleast for me). Wind drift is tied to velocity loss RATE(this is not TOF). Low BC bullets launched at very high velocities(low TOF) loose velocity at a higher rate than high BC bullets launched at low velocities(hi TOF). Given this, near wind pushes the largest velocity drop rate(esp. w/lower BC bullet) to cause a greater angular error down range, than it would for the lower velocity loss rate bullet. Most(not all) ballistic programs assume wind entry applies to the full bullet flight, but it's really the first couple hundred yards of wind that dominates results. It's the first couple hundred yards that a bullet's velocity loss rate is highest. Anyway, it's fun to think about something that is new and different here [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Importance of T.O.F.???
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