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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="Michael Eichele" data-source="post: 476034" data-attributes="member: 1007"><p>This has all been done. Over and over. I have used bergers program, JBM, RSI Shooting Lab, Barnes, and my own personally developed software among many others. Several of which are highly esteemed. When used properly, I get nearly identical results between programs. Some minor differences yes but VERY minor. Years ago I used station pressure corrected for sea level and inputed altitude. Now I use station pressure and forget the altitude. Either way, the results work out the same. I currently use station pressure only to simplify the system. I am not new at this game. If there is a viable explaination here, it isnt the obvious such as scope height, calibration, using the wrong pressure, temp or humidity etc......Those bases are covered. </p><p></p><p>Assuming that it is my chronies, why then does one bullet match Litz's within a fraction of a percent, another 3% and another 8% and another by 5%? Would you not think that if my chrony was the sole culprit and innaccurate by say 2% that this would be reflected through out all the testing and experiments that have been done? I could even live with a window of 2-3% but when it shows such a large gap, there is more to it than velocity errors. That does not explain why so many in this thread say the G7 is not affected by velocity yet when I use the same testing equipment and same methods using different velocities, they are different. Even with the SAME 'calibrated' scope.</p><p></p><p>I will offer this example as a basis for my skepticizm about innaccurate velocities being the sole factor here. </p><p></p><p>Using the 178 AMAX and 3242 FPS and a .290 BC matched my drops perfectly in any enviornment. To assume that the Litz BC is correct, I would have to adjust my velcoity to 3456 FPS. I doubt very seriously that this rifle was capable of shooting that bullet that fast with the powder that was being used. Between my personal chrony and a friends ohler, neither were close to the 3450+ mark. I am not saying there were some velocity innaccuracies at play here but I have a hard time believing that this is the sole reason. The gap is too large. Are chronies innaccurate? Yes, I believe they are. Are they close? I believe they are. </p><p></p><p>I am still looking for viable answers.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 476034, member: 1007"] This has all been done. Over and over. I have used bergers program, JBM, RSI Shooting Lab, Barnes, and my own personally developed software among many others. Several of which are highly esteemed. When used properly, I get nearly identical results between programs. Some minor differences yes but VERY minor. Years ago I used station pressure corrected for sea level and inputed altitude. Now I use station pressure and forget the altitude. Either way, the results work out the same. I currently use station pressure only to simplify the system. I am not new at this game. If there is a viable explaination here, it isnt the obvious such as scope height, calibration, using the wrong pressure, temp or humidity etc......Those bases are covered. Assuming that it is my chronies, why then does one bullet match Litz's within a fraction of a percent, another 3% and another 8% and another by 5%? Would you not think that if my chrony was the sole culprit and innaccurate by say 2% that this would be reflected through out all the testing and experiments that have been done? I could even live with a window of 2-3% but when it shows such a large gap, there is more to it than velocity errors. That does not explain why so many in this thread say the G7 is not affected by velocity yet when I use the same testing equipment and same methods using different velocities, they are different. Even with the SAME 'calibrated' scope. I will offer this example as a basis for my skepticizm about innaccurate velocities being the sole factor here. Using the 178 AMAX and 3242 FPS and a .290 BC matched my drops perfectly in any enviornment. To assume that the Litz BC is correct, I would have to adjust my velcoity to 3456 FPS. I doubt very seriously that this rifle was capable of shooting that bullet that fast with the powder that was being used. Between my personal chrony and a friends ohler, neither were close to the 3450+ mark. I am not saying there were some velocity innaccuracies at play here but I have a hard time believing that this is the sole reason. The gap is too large. Are chronies innaccurate? Yes, I believe they are. Are they close? I believe they are. I am still looking for viable answers. [/QUOTE]
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Let's argue about BC's
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