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What caliber for a sheep rifle?
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<blockquote data-quote="Fiftydriver" data-source="post: 124497" data-attributes="member: 10"><p>BJlooper,</p><p></p><p>WHAT????</p><p></p><p>Did you just say what I think you said, BC has nothing to do with wind drift, only time of flight????</p><p></p><p>I must have read that wrong.</p><p></p><p>One simple example, even out to a relatively short range is comparing my 7mm AM loaded with 160 gr Accubonds and 200 gr ULD RBBTs. The 160 gr Accubonds can be loaded to 3500 fps comfortably and the 200 gr ULD can be loaded to 3250 fps comfortably as well.</p><p></p><p>With the same conditions and a 10 mph cross wind, here are the stats for the 160 gr pill at 500 yards:</p><p></p><p>Time of flight.......0.488 seconds</p><p>Wind drift...........10.8"</p><p>Retained velocity....2747 fps</p><p>retained energy......2680 ft/lbs</p><p></p><p>For the much slower 200 gr ULD RBBT</p><p></p><p>Time of Flight.......0.501 seconds</p><p>Wind drift...........7.1"</p><p>Retained velocity....2753 fps</p><p>Retained energy......3365 ft/lbs</p><p></p><p>As you can see the time of flight is significantly longer for the slower 200 gr ULD RBBT but wind drift is over 30% less at 500 yards. Velocity is nearly identical at 500 yards between the two but the energy is dramatically in favor of the higher BC slower starting bullet.</p><p></p><p>Another example, lets take the 243 loaded with a 105 gr A-max at only 3000 fps and a 75 gr V-Max at 3500 fps.</p><p></p><p>At 500 yards this is what you get:</p><p></p><p>75 gr V-Max</p><p>Time of Flight.......0.541 sec</p><p>Wind drift...........20.0"</p><p>Retained velocity....2204 fps</p><p>Retained energy......809 ft/lbs</p><p></p><p>105 gr A-max</p><p>Time of Flight.......0.585 sec</p><p>Wind Drift...........15.1"</p><p>Retained velocity....2193 fps</p><p>Retained energy......1121 ft/lbs</p><p></p><p>I could do this with every caliber out there comparing higher BC bullets at lower velocities to high velocity lower BC bullets.</p><p></p><p>I have to respectfully disagree with your opinion and statement that BC has nothing to do with wind drift. That is about as far from what actually occurs in bullet flight as you can get. BC effect wind drift as much or more so then any other aspect of bullet flight.</p><p></p><p>SO back to my original starting statement, "WHAT????"</p><p></p><p>Please explain your opinion on the matter a bit more I would be interested in the basis of your comments. I would agree, that as far as bullet drop you may have a point but concerning wind drift you are incorrect in my opinion from what I have actually seen testing high BC bullets against high velocity conventional BC bullets.</p><p></p><p>Bullet drop is consistant and easy to figure. Wind drift is what will kick your rear and the higher the BC the bullet the less effect the wind will have at any velocity.</p><p></p><p>I will take more bullet drop then wind drift any day of the week!!</p><p></p><p>Are you confusing bullet drop and wind drift concerning BC?? If you were arguing bullet drop I think you would have a more solid point.</p><p></p><p>Good Shooting,</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 124497, member: 10"] BJlooper, WHAT???? Did you just say what I think you said, BC has nothing to do with wind drift, only time of flight???? I must have read that wrong. One simple example, even out to a relatively short range is comparing my 7mm AM loaded with 160 gr Accubonds and 200 gr ULD RBBTs. The 160 gr Accubonds can be loaded to 3500 fps comfortably and the 200 gr ULD can be loaded to 3250 fps comfortably as well. With the same conditions and a 10 mph cross wind, here are the stats for the 160 gr pill at 500 yards: Time of flight.......0.488 seconds Wind drift...........10.8" Retained velocity....2747 fps retained energy......2680 ft/lbs For the much slower 200 gr ULD RBBT Time of Flight.......0.501 seconds Wind drift...........7.1" Retained velocity....2753 fps Retained energy......3365 ft/lbs As you can see the time of flight is significantly longer for the slower 200 gr ULD RBBT but wind drift is over 30% less at 500 yards. Velocity is nearly identical at 500 yards between the two but the energy is dramatically in favor of the higher BC slower starting bullet. Another example, lets take the 243 loaded with a 105 gr A-max at only 3000 fps and a 75 gr V-Max at 3500 fps. At 500 yards this is what you get: 75 gr V-Max Time of Flight.......0.541 sec Wind drift...........20.0" Retained velocity....2204 fps Retained energy......809 ft/lbs 105 gr A-max Time of Flight.......0.585 sec Wind Drift...........15.1" Retained velocity....2193 fps Retained energy......1121 ft/lbs I could do this with every caliber out there comparing higher BC bullets at lower velocities to high velocity lower BC bullets. I have to respectfully disagree with your opinion and statement that BC has nothing to do with wind drift. That is about as far from what actually occurs in bullet flight as you can get. BC effect wind drift as much or more so then any other aspect of bullet flight. SO back to my original starting statement, "WHAT????" Please explain your opinion on the matter a bit more I would be interested in the basis of your comments. I would agree, that as far as bullet drop you may have a point but concerning wind drift you are incorrect in my opinion from what I have actually seen testing high BC bullets against high velocity conventional BC bullets. Bullet drop is consistant and easy to figure. Wind drift is what will kick your rear and the higher the BC the bullet the less effect the wind will have at any velocity. I will take more bullet drop then wind drift any day of the week!! Are you confusing bullet drop and wind drift concerning BC?? If you were arguing bullet drop I think you would have a more solid point. Good Shooting, Kirby Allen(50) [/QUOTE]
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