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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet BC
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<blockquote data-quote="Eaglet" data-source="post: 168334" data-attributes="member: 3756"><p><span style="color: black">I have also experienced, like many, almost always </span><span style="color: red">when using VLD type bullets</span><span style="color: black">, SMK, etc., the BC that we need to use for long range will need to be higher than the published BC; this is because by using published BCs at ranges longer than about 500 yards, we usually have points of impact higher than what the drop table is telling us. As we know, to fix it we have to kick the BC up until we come up with a higher number to match our impact point at longer ranges telling the ballistic application that our bullets fly flatter than what the application is telling us. The reason is that most ballistic programs use the G1 BCs with the G1 drag model which is for flat base spitzer type bullets. This model if far from fitting the VLD type bullets. Other applications atemp to make the G1 model fit the G5 and G7 models which fit the VLD better, but at best they just get a bit closer. That's the reason I like <a href="http://www.patagoniaballistics.com/index.html" target="_blank"><span style="color: #800080">LoadBase 2.0</span></a>, because it's <strong><u>unique</u></strong> in its ability to use G1 ballistic coefficients which are widely available but yet it does not use the G1 drag model, instead it will do complicated calculations to create internally a model for the specific bullet that's coming out of your rifle. The thing is to collect four velocities at different distances using a good chronograph, weather conditions, and let the program do its thing. It will calculate a BC with a Drag value that will allow you basically to have a custom model for your very own bullet.</span></p><p><span style="color: black">I have yet not been able to collect those velocities but I have done other tricks that have allowed my drop tables to be closer than ever before.</span></p><p><span style="color: black">I hope I did not bore you guys to death! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></span></p><p><span style="color: black">I almost forgot my main reason to post, LoadBase 2.0 has in its data base </span><strong><span style="color: blue"><span style="font-family: 'Verdana'">2945 bullets ranging from BC = 0.026 to BC = 1.095 </span></span></strong><strong><span style="color: black"><span style="font-family: 'Verdana'">including info like:</span></span></strong><span style="color: black"> Manufacturer, bullet type, bullet name, stock #, Bullet diameter, bullet caliber, bullet length and bullet weight.</span></p><p><span style="color: black">No, I'm not a salesman for Patagonia Ballistic nor I'm receiving commissions, but maybe I should. Ha? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /></span></p></blockquote><p></p>
[QUOTE="Eaglet, post: 168334, member: 3756"] [COLOR=black]I have also experienced, like many, almost always [/COLOR][COLOR=red]when using VLD type bullets[/COLOR][COLOR=black], SMK, etc., the BC that we need to use for long range will need to be higher than the published BC; this is because by using published BCs at ranges longer than about 500 yards, we usually have points of impact higher than what the drop table is telling us. As we know, to fix it we have to kick the BC up until we come up with a higher number to match our impact point at longer ranges telling the ballistic application that our bullets fly flatter than what the application is telling us. The reason is that most ballistic programs use the G1 BCs with the G1 drag model which is for flat base spitzer type bullets. This model if far from fitting the VLD type bullets. Other applications atemp to make the G1 model fit the G5 and G7 models which fit the VLD better, but at best they just get a bit closer. That's the reason I like [URL="http://www.patagoniaballistics.com/index.html"][COLOR=#800080]LoadBase 2.0[/COLOR][/URL], because it's [B][U]unique[/U][/B] in its ability to use G1 ballistic coefficients which are widely available but yet it does not use the G1 drag model, instead it will do complicated calculations to create internally a model for the specific bullet that's coming out of your rifle. The thing is to collect four velocities at different distances using a good chronograph, weather conditions, and let the program do its thing. It will calculate a BC with a Drag value that will allow you basically to have a custom model for your very own bullet.[/COLOR] [COLOR=black]I have yet not been able to collect those velocities but I have done other tricks that have allowed my drop tables to be closer than ever before.[/COLOR] [COLOR=black]I hope I did not bore you guys to death! :)[/COLOR] [COLOR=black]I almost forgot my main reason to post, LoadBase 2.0 has in its data base [/COLOR][B][COLOR=blue][FONT=Verdana]2945 bullets ranging from BC = 0.026 to BC = 1.095 [/FONT][/COLOR][/B][B][COLOR=black][FONT=Verdana]including info like:[/FONT][/COLOR][/B][COLOR=black] Manufacturer, bullet type, bullet name, stock #, Bullet diameter, bullet caliber, bullet length and bullet weight.[/COLOR] [COLOR=black]No, I'm not a salesman for Patagonia Ballistic nor I'm receiving commissions, but maybe I should. Ha? :confused:[/COLOR] [/QUOTE]
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