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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic mystery, would like your thoughts.....
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<blockquote data-quote="Fiftydriver" data-source="post: 159942" data-attributes="member: 10"><p>Gustavo and Eaglet,</p><p> </p><p>Exactly how much of the output data do you want????</p><p> </p><p>Here are the specs for the shooting conditions:</p><p> </p><p>Alt.........................3550 ft</p><p>Temp.....................70 degree F</p><p>Bar press at alt........26.43</p><p>Humidity.................37.0%</p><p> </p><p>Average muzzle velocity............3460 fps</p><p>Scope height...........................2.05"</p><p>BC used for Ballistic program.......0.92</p><p>zero range...............................100 yards</p><p> </p><p>Now before someone goes and blows a gasket over the BC I listed, I am not saying this is the BC of the bullet. This is just where I started with my Ballistic program to start the process to get the generated drop chart to match up with actual trajectory. JUST A NUMBER!!!</p><p> </p><p>Now with that data My handheld listed the following dial ups in MOAs for each range. I will also include the actual moas needed to hit the target consistantly at each range as well to compare the drop chart with actual bullet flight.</p><p> </p><p>927 yards</p><p>predicted moa.....................12.5 moa</p><p>Actual moa.........................13.5 moa</p><p> </p><p>1915 yards</p><p>Predicted moa.....................38.0 </p><p>Actual moa.........................35.75</p><p> </p><p>2410 yards</p><p>Predicted moa.....................56.5 </p><p>Actual moa.........................54.75</p><p> </p><p>3008 yards</p><p>Predicted moa.....................88.25</p><p>Actual moa.........................86 </p><p> </p><p>That was with my initial drop chart. As you can see, All I needed to do was play with the zero range to get the drop chart to match almost perfectly with the 1915, 2410 and 3008 yard drop figures. </p><p> </p><p>On a different ballistic program I use off my main computer I developed another drop chart. Still using the standard G1 drag function at this time. All specs were the same except I tweaked the zero range until my drop numbers matched up with my actual bullet flight. Using a zero range if 335 yards, here are the predicted numbers for comparision:</p><p> </p><p>927 yards</p><p>10.5 moa predicted</p><p>13.5 moa actual</p><p>difference of 3 moa </p><p> </p><p>1915 yards</p><p>36.0 moa predicted</p><p>35.34 moa actual</p><p>difference of 1/4 moa</p><p> </p><p>2410 yards</p><p>54.75 moa predicted</p><p>54.75 moa actual</p><p>difference of 0 moa</p><p> </p><p>3008 yards</p><p>86.0 moa predicted</p><p>86.0 moa actual</p><p>Difference 0 moa</p><p> </p><p>So now you can see that from ranges of 1900 to 3000 yards, the drop chart is pretty much perfect. The issue is the 3 moa difference at 927 yards.</p><p> </p><p>Hope this is what your looking for. If you want the complete print out, I can do that as well but its the same numbers here, at least the ones I have solid data to compare to.</p><p> </p><p>As mentioned, more testing is needed at close range. I have also been playing with the G7 drag function as well and it seems to be getting me a bit closer as well. I just need to get out and check to see if the zero is at 335 yards or where in fact the rifle is zeroed at currently, that will tell me alot and then I will shoot alot more at all ranges and just tweak here and there until my drop chart matches actual bullet flight as usual.</p><p> </p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 159942, member: 10"] Gustavo and Eaglet, Exactly how much of the output data do you want???? Here are the specs for the shooting conditions: Alt.........................3550 ft Temp.....................70 degree F Bar press at alt........26.43 Humidity.................37.0% Average muzzle velocity............3460 fps Scope height...........................2.05" BC used for Ballistic program.......0.92 zero range...............................100 yards Now before someone goes and blows a gasket over the BC I listed, I am not saying this is the BC of the bullet. This is just where I started with my Ballistic program to start the process to get the generated drop chart to match up with actual trajectory. JUST A NUMBER!!! Now with that data My handheld listed the following dial ups in MOAs for each range. I will also include the actual moas needed to hit the target consistantly at each range as well to compare the drop chart with actual bullet flight. 927 yards predicted moa.....................12.5 moa Actual moa.........................13.5 moa 1915 yards Predicted moa.....................38.0 Actual moa.........................35.75 2410 yards Predicted moa.....................56.5 Actual moa.........................54.75 3008 yards Predicted moa.....................88.25 Actual moa.........................86 That was with my initial drop chart. As you can see, All I needed to do was play with the zero range to get the drop chart to match almost perfectly with the 1915, 2410 and 3008 yard drop figures. On a different ballistic program I use off my main computer I developed another drop chart. Still using the standard G1 drag function at this time. All specs were the same except I tweaked the zero range until my drop numbers matched up with my actual bullet flight. Using a zero range if 335 yards, here are the predicted numbers for comparision: 927 yards 10.5 moa predicted 13.5 moa actual difference of 3 moa 1915 yards 36.0 moa predicted 35.34 moa actual difference of 1/4 moa 2410 yards 54.75 moa predicted 54.75 moa actual difference of 0 moa 3008 yards 86.0 moa predicted 86.0 moa actual Difference 0 moa So now you can see that from ranges of 1900 to 3000 yards, the drop chart is pretty much perfect. The issue is the 3 moa difference at 927 yards. Hope this is what your looking for. If you want the complete print out, I can do that as well but its the same numbers here, at least the ones I have solid data to compare to. As mentioned, more testing is needed at close range. I have also been playing with the G7 drag function as well and it seems to be getting me a bit closer as well. I just need to get out and check to see if the zero is at 335 yards or where in fact the rifle is zeroed at currently, that will tell me alot and then I will shoot alot more at all ranges and just tweak here and there until my drop chart matches actual bullet flight as usual. Kirby Allen(50) [/QUOTE]
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Ballistic mystery, would like your thoughts.....
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