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Long Range Hunting & Shooting
Left @ 300 yds - Right @ 1000 yds? WTH?
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<blockquote data-quote="Pdvdh" data-source="post: 247937" data-attributes="member: 4191"><p>Roy,</p><p></p><p>At Latitude 44 Degrees North, MV of 3056 fps, BC of 0.667, Altitude of 290 feet, I get 2.3" Coriolis drift @ 800yds, 3.6" Coriolis drift @ 1000yds, and 5.2" Coriolis drift @ 1200yds. The Coriolis drift will be to the right. You have less drift down there in the real world because my Latitude up here is 61 Degrees.</p><p></p><p>You could expect about 8-9 inches of left to right spindrift on average @ 1000 yds. Spindrift increases at an increasing rate at greater distances. The only way I know to quantify your spindrift is to make sure your equipment is all plumb with the world and then shoot like I did on a windless day at extended ranges. If you shoot a reasonably tight group you'll be able to ID and measure your left to right drift. By subtracting Coriolis drift from your <strong>total </strong>measured drift, you'd be ID'ing the spindrift from your specific rifle, load, and barrel.</p><p></p><p>Make sense? Nothing's free. I spent a buttload of time to come to my conclusions, so expect to put in some time if you want to quantitate your spindrift. If you don't want to go throught the effort, then count on 8-9 inches spindrift at 1000 yds and 3.6" Coriolis drift. Spindrift will always be <strong>right-ward </strong>drift with a right twist barrel, and Coriolis drift will always be <strong>right-ward </strong>drift on our side of the equator.</p><p></p><p>Let'me know if you've got any further questions. I'm not claiming to be an expert at this but I'll only offer information after I'm pretty confident I've got it properly figured out myself.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 247937, member: 4191"] [B][/B]Roy, At Latitude 44 Degrees North, MV of 3056 fps, BC of 0.667, Altitude of 290 feet, I get 2.3" Coriolis drift @ 800yds, 3.6" Coriolis drift @ 1000yds, and 5.2" Coriolis drift @ 1200yds. The Coriolis drift will be to the right. You have less drift down there in the real world because my Latitude up here is 61 Degrees. You could expect about 8-9 inches of left to right spindrift on average @ 1000 yds. Spindrift increases at an increasing rate at greater distances. The only way I know to quantify your spindrift is to make sure your equipment is all plumb with the world and then shoot like I did on a windless day at extended ranges. If you shoot a reasonably tight group you'll be able to ID and measure your left to right drift. By subtracting Coriolis drift from your [B]total [/B]measured drift, you'd be ID'ing the spindrift from your specific rifle, load, and barrel. Make sense? Nothing's free. I spent a buttload of time to come to my conclusions, so expect to put in some time if you want to quantitate your spindrift. If you don't want to go throught the effort, then count on 8-9 inches spindrift at 1000 yds and 3.6" Coriolis drift. Spindrift will always be [B]right-ward [/B]drift with a right twist barrel, and Coriolis drift will always be [B]right-ward [/B]drift on our side of the equator. Let'me know if you've got any further questions. I'm not claiming to be an expert at this but I'll only offer information after I'm pretty confident I've got it properly figured out myself. [/QUOTE]
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Left @ 300 yds - Right @ 1000 yds? WTH?
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