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Long Range Hunting & Shooting
**HELP** Need to understand trajectory(heavy VS light) in bullets.
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<blockquote data-quote="Kevin Thomas" data-source="post: 448597" data-attributes="member: 15748"><p>An accurate description of the Coriolis effect, and an interesting thread here. For what it's worth, at one time, I believe it was Colt that rifled their guns in one way for sales in the Northern Hemisphere, and the opposite for sales in teh Southern Hemisphere. They eventually discontinued when it was determined that the difference caused by the Coriolis effect was, "measureable, but negligable." As you can envision by Chuck's description here, it's a matter of time of flight. For the second and a half to three seconds that our small arms bullets are in flight, the distance involved is minor. You also have to take into account that this effect changes with the azimuth in which the shot is taken, East/West (or vice versa) shots should show virtually no difference. Those taken along a North/South axis will show something. But again, it's repeatable, so after the sight's clicked a minute or so to correct, that's the end of it from that firing position and target.</p><p> </p><p>Longer times of flight, such as that seen in artillery, the difference becomes very pronounced, and it MUST be taken into account and corrected for. Is it any wonder that the first real computers were designed to control naval gunnery? Stop and think about the physics here for a moment. Two battleships engage at a distance of 20 miles or so. The times of flight for their main gun projectiles are 30-45 seconds or more, you're dealing with vessels that have a top speed of 30 knots, making a combined closure speed of something near 70 MPH. Add the fact that each can be heading in any azimuth relative to the other. Now try to solve that ballistics problem in a hurry when the other guy is lobbing 15" shells at you. No pressure. </p><p> </p><p>When we get into ICBMs coming over the pole with flight times of 30 minutes or so, again, it's a factor that HAS to be taken into account and corrected for. Example: The Russians aim their ICBM at Kansas City, and forget to calculate Coriolis into the equation. Thirty minutes later, they wind up hitting St. Louis instead. (Whether that's a good thing or not is probably a topic for another thread, depending on whether your a Chiefs or Rams fan). Either way, it was the Coriolis factor that caused the miss.</p><p> </p><p>ICBMs, 15" shells fired from the Bismarck, or a 210 grain Berger from a 300 Win Mag, it's all the same thing, differeing only in matters of scale and degree.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 448597, member: 15748"] An accurate description of the Coriolis effect, and an interesting thread here. For what it's worth, at one time, I believe it was Colt that rifled their guns in one way for sales in the Northern Hemisphere, and the opposite for sales in teh Southern Hemisphere. They eventually discontinued when it was determined that the difference caused by the Coriolis effect was, "measureable, but negligable." As you can envision by Chuck's description here, it's a matter of time of flight. For the second and a half to three seconds that our small arms bullets are in flight, the distance involved is minor. You also have to take into account that this effect changes with the azimuth in which the shot is taken, East/West (or vice versa) shots should show virtually no difference. Those taken along a North/South axis will show something. But again, it's repeatable, so after the sight's clicked a minute or so to correct, that's the end of it from that firing position and target. Longer times of flight, such as that seen in artillery, the difference becomes very pronounced, and it MUST be taken into account and corrected for. Is it any wonder that the first real computers were designed to control naval gunnery? Stop and think about the physics here for a moment. Two battleships engage at a distance of 20 miles or so. The times of flight for their main gun projectiles are 30-45 seconds or more, you're dealing with vessels that have a top speed of 30 knots, making a combined closure speed of something near 70 MPH. Add the fact that each can be heading in any azimuth relative to the other. Now try to solve that ballistics problem in a hurry when the other guy is lobbing 15" shells at you. No pressure. When we get into ICBMs coming over the pole with flight times of 30 minutes or so, again, it's a factor that HAS to be taken into account and corrected for. Example: The Russians aim their ICBM at Kansas City, and forget to calculate Coriolis into the equation. Thirty minutes later, they wind up hitting St. Louis instead. (Whether that's a good thing or not is probably a topic for another thread, depending on whether your a Chiefs or Rams fan). Either way, it was the Coriolis factor that caused the miss. ICBMs, 15" shells fired from the Bismarck, or a 210 grain Berger from a 300 Win Mag, it's all the same thing, differeing only in matters of scale and degree. [/QUOTE]
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**HELP** Need to understand trajectory(heavy VS light) in bullets.
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