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<blockquote data-quote="Eaglet" data-source="post: 396934" data-attributes="member: 3756"><p><span style="color: black"><span style="font-family: 'Verdana'">Just a thought about changing velocities to hit the target...</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Down below I have two images together of the same graph; the</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">first one is in 3D and the second one in 2D... Just so we can visualize</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">what's coming.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">The Graph has 4 ballistic curves. Every thing is the same with the exception</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">of the DC (Drag Coefficient). The First 3D graph shows what each color represents.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Basically I'm graphing how the ballistic curve reacts when I change the DC.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">As the DC increases it straightens out the curve making it flatter, and as the </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">DC decreases it bends the curve showing more of a drop.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">From DC = 0.1 to DC = 0.9 the curve is manipulated until it fits all of our data. Meaning all the impact points for the many different distances we</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">shot our data for. For good BC's like the ones found in Bryan Litz's book I</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">would not be surprised if you have to do much to get it right on very quickly.</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">If you're using factory so, so, BC, and do not find your sweet spot just by </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">changing the DC then you might have to get your DC back to 0.500 and make</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">a small change to your BC's value. If you want the curve to be flatter you increase the value of your BC and decrease it to make the ballistic curve bow </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">some more for more drop, always trying to fit the existing data.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Once all is done, there will be a setting that will work just right; you want to </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">stick to that setting.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Now let's assume that you do not know what those settings are. You zero your rifle at 100 yards, crank your turret up to shoot at 1000 yards and you hit </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">8 inches low. You ask Exbal what your velocity needs to be to hit the </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">target, LB3.0 will not allow you to do that for a reason; it's not good practice, so... Exbal tells you to lower your muzzle velocity so that you can increase your come-ups to hit the target... I hate that!!! ---- You know, maybe you were just using a ballistic curve that looked like the yellow one on the graph, and all you need is to adjust your DC to make it fit across the board.</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">Just maybe you only needed to warp your curve to look like the red one and</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">now you would need more come-ups to be on target.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">But now, by changing the velocity instead of taking the chronographed velocity, we just compounded the problem by adding another variable.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">I believe we need to use the best possible chronograph in the field, take that velocity input it in a trustable ballistic application with the rest of the </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">conditions values; after you zero in at 100 yards, (your preference), shoot</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">at 400 yards, 700 yards, 1000 yards and 1200 yards. Of course we know your scope turrets are working just right. Write down the turret come-ups for each</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">distance, from the center of each group measure distance to center of target, </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">take this data and using your DC start curving or straightening your existing field</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">obtained ballistic curve until it all fits. I don't think we have to do it every 50 yards all the way to 1000 yards... That's fruitless; you can only manipulate the curve so much.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Now you say: Well, I've seen so and so doing that at 1500 yards and he is a successful long range hunter.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Temperature Changes your muzzle velocity; that will depend on how sensitive your powder is to temperature changes. Our expert long range shooter has gone to the process of finding the right settings in a way kind of similar to what I explained before. He did his homework, he knows what's at stake. He knows his settings are right on for a given muzzle velocity. When he sees a low hit at long ranges, when it should not have happened, he knows temperature is changing his muzzle velocity enough to do that and now is only right to question, What is my muzzle velocity? That is just fine. But it's not fine to start doing that when you have not developed settings for your particular load that</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">at a given set of conditions will run just beautifully.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Hopefully I made some sense... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> Remember, just my thoughts...</span></span></p><p> </p><p> </p><p> </p><p> </p><p><img src="http://pages.sbcglobal.net/jomoncada/LRH/diff_DCs_1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Eaglet, post: 396934, member: 3756"] [COLOR=black][FONT=Verdana]Just a thought about changing velocities to hit the target...[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Down below I have two images together of the same graph; the[/FONT][/COLOR] [COLOR=black][FONT=Verdana]first one is in 3D and the second one in 2D... Just so we can visualize[/FONT][/COLOR] [COLOR=black][FONT=Verdana]what's coming.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]The Graph has 4 ballistic curves. Every thing is the same with the exception[/FONT][/COLOR] [COLOR=black][FONT=Verdana]of the DC (Drag Coefficient). The First 3D graph shows what each color represents.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Basically I'm graphing how the ballistic curve reacts when I change the DC.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]As the DC increases it straightens out the curve making it flatter, and as the [/FONT][/COLOR] [COLOR=black][FONT=Verdana]DC decreases it bends the curve showing more of a drop.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]From DC = 0.1 to DC = 0.9 the curve is manipulated until it fits all of our data. Meaning all the impact points for the many different distances we[/FONT][/COLOR] [COLOR=black][FONT=Verdana]shot our data for. For good BC's like the ones found in Bryan Litz's book I[/FONT][/COLOR] [COLOR=black][FONT=Verdana]would not be surprised if you have to do much to get it right on very quickly.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]If you're using factory so, so, BC, and do not find your sweet spot just by [/FONT][/COLOR] [COLOR=black][FONT=Verdana]changing the DC then you might have to get your DC back to 0.500 and make[/FONT][/COLOR] [COLOR=black][FONT=Verdana]a small change to your BC's value. If you want the curve to be flatter you increase the value of your BC and decrease it to make the ballistic curve bow [/FONT][/COLOR] [COLOR=black][FONT=Verdana]some more for more drop, always trying to fit the existing data.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Once all is done, there will be a setting that will work just right; you want to [/FONT][/COLOR] [COLOR=black][FONT=Verdana]stick to that setting.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Now let's assume that you do not know what those settings are. You zero your rifle at 100 yards, crank your turret up to shoot at 1000 yards and you hit [/FONT][/COLOR] [COLOR=black][FONT=Verdana]8 inches low. You ask Exbal what your velocity needs to be to hit the [/FONT][/COLOR] [COLOR=black][FONT=Verdana]target, LB3.0 will not allow you to do that for a reason; it's not good practice, so... Exbal tells you to lower your muzzle velocity so that you can increase your come-ups to hit the target... I hate that!!! ---- You know, maybe you were just using a ballistic curve that looked like the yellow one on the graph, and all you need is to adjust your DC to make it fit across the board.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Just maybe you only needed to warp your curve to look like the red one and[/FONT][/COLOR] [COLOR=black][FONT=Verdana]now you would need more come-ups to be on target.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]But now, by changing the velocity instead of taking the chronographed velocity, we just compounded the problem by adding another variable.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]I believe we need to use the best possible chronograph in the field, take that velocity input it in a trustable ballistic application with the rest of the [/FONT][/COLOR] [COLOR=black][FONT=Verdana]conditions values; after you zero in at 100 yards, (your preference), shoot[/FONT][/COLOR] [COLOR=black][FONT=Verdana]at 400 yards, 700 yards, 1000 yards and 1200 yards. Of course we know your scope turrets are working just right. Write down the turret come-ups for each[/FONT][/COLOR] [COLOR=black][FONT=Verdana]distance, from the center of each group measure distance to center of target, [/FONT][/COLOR] [COLOR=black][FONT=Verdana]take this data and using your DC start curving or straightening your existing field[/FONT][/COLOR] [COLOR=black][FONT=Verdana]obtained ballistic curve until it all fits. I don't think we have to do it every 50 yards all the way to 1000 yards... That's fruitless; you can only manipulate the curve so much.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Now you say: Well, I've seen so and so doing that at 1500 yards and he is a successful long range hunter.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Temperature Changes your muzzle velocity; that will depend on how sensitive your powder is to temperature changes. Our expert long range shooter has gone to the process of finding the right settings in a way kind of similar to what I explained before. He did his homework, he knows what's at stake. He knows his settings are right on for a given muzzle velocity. When he sees a low hit at long ranges, when it should not have happened, he knows temperature is changing his muzzle velocity enough to do that and now is only right to question, What is my muzzle velocity? That is just fine. But it's not fine to start doing that when you have not developed settings for your particular load that[/FONT][/COLOR] [COLOR=black][FONT=Verdana]at a given set of conditions will run just beautifully.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Hopefully I made some sense... :D Remember, just my thoughts...[/FONT][/COLOR] [IMG]http://pages.sbcglobal.net/jomoncada/LRH/diff_DCs_1.jpg[/IMG] [/QUOTE]
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