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Coriolis Effect Questions
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<blockquote data-quote="Pdvdh" data-source="post: 406797" data-attributes="member: 4191"><p>That question would be a matter of opinion. If a target shooter or hunter can take some sighter shots before engaging the game or the competition, then the scope can be adjusted so all is good before taking the shots that count.</p><p></p><p>Depends on your Latitude also. I hunt from 59* to 64* North Latitude, and Coriolis drift is a little greater here than at 40* North Latitude.</p><p></p><p>When you're thrown into a hunting situation where there's not opportunity for sighter rounds down range, and first round hits are all that count, I consider the horizontal deflection of Coriolis to become large enough (~1.5 inches) to include in my dope at around the ~600 yard range. The vertical deflection component of Coriolis drift is of less magnitude than the horizontal component, and the vertical component may only reach the ~1.5 inches at more like ~1000 yds. Don't hold me to the exact values of drift. The ~ means approximately.</p><p></p><p>Add the bullet's spin drift to Coriolis drift, and rightward horizontal deflection at 1000 yds can be ~9-10", in my real life experiences - which pretty closely match the Patagonia Ballistics LoadBase 3.0 predicted magnitudes of rightward drift.</p><p></p><p>To put this in perspective, at 1000 yds, a steady & constant 2 mph crosswind will produce more drift than both Coriolis an Spin drift - combined. So a lot of guys that hunt in windy areas may not be able to distinguish - on target - the Coriolis and Spin Drift from the 5-10 mph Wind caused drift. The nice thing about Coriolis and Spin Drift is that their magnitude of drift can be doped for more easily than wind conditions - because they're a by-product of Latitude, direction of fire (azimuth), air density, etc. - factors which are less variable than wind, which can change direction and speed without a moment's notice.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 406797, member: 4191"] That question would be a matter of opinion. If a target shooter or hunter can take some sighter shots before engaging the game or the competition, then the scope can be adjusted so all is good before taking the shots that count. Depends on your Latitude also. I hunt from 59* to 64* North Latitude, and Coriolis drift is a little greater here than at 40* North Latitude. When you're thrown into a hunting situation where there's not opportunity for sighter rounds down range, and first round hits are all that count, I consider the horizontal deflection of Coriolis to become large enough (~1.5 inches) to include in my dope at around the ~600 yard range. The vertical deflection component of Coriolis drift is of less magnitude than the horizontal component, and the vertical component may only reach the ~1.5 inches at more like ~1000 yds. Don't hold me to the exact values of drift. The ~ means approximately. Add the bullet's spin drift to Coriolis drift, and rightward horizontal deflection at 1000 yds can be ~9-10", in my real life experiences - which pretty closely match the Patagonia Ballistics LoadBase 3.0 predicted magnitudes of rightward drift. To put this in perspective, at 1000 yds, a steady & constant 2 mph crosswind will produce more drift than both Coriolis an Spin drift - combined. So a lot of guys that hunt in windy areas may not be able to distinguish - on target - the Coriolis and Spin Drift from the 5-10 mph Wind caused drift. The nice thing about Coriolis and Spin Drift is that their magnitude of drift can be doped for more easily than wind conditions - because they're a by-product of Latitude, direction of fire (azimuth), air density, etc. - factors which are less variable than wind, which can change direction and speed without a moment's notice. [/QUOTE]
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