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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
ballistic coefficient on bullets
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<blockquote data-quote="Michael Eichele" data-source="post: 130662" data-attributes="member: 1007"><p>In alot of cases (all cases), differant bullets will have a differant BC for a given powder charge, load density, barrel length, twist rate, velocity, air density, and I am sure a few other things we havent discovered yet.</p><p></p><p>It is almost always a waste of time to use the factories published BC for anything past 400-500 yards anyway. So you might as well just try differant bullets and figure out what they are dropping in what air density. Then cross referancing this real world data with a good ballistic calculator, you can come up with a real BC for your rifle/load combo. Published BC's are only an average based on a controlled enviornment and specifec barrel length/twist combo's. Trust me, it is no waste of time to fire away and figure out the real BC in the real world with your equipment.</p><p></p><p>Also, if youre interested in using a particular bullet with no published BC and want a rough estimate, BC can be calculated. Please note that sometimes this will be close and sometimes it might be way off the mark. Most of the time, it will give you an idea based on physics. It takes a BC calculator to do this. These can be found in several ballistic calculators both PC and web based.</p><p></p><p>It is also more important to have a bullet that shoots good in your rifle with a lower BC than one that shoots bad yet boasts a high one. Obviously this is to a point of balance as a really low BC will have a detrimental effect on overall performance at 1000 yards. At that point, sure 1 MOA 100 yard accuracy and a high BC would be better than 1/2 MOA 100 yard accuracy and a very low BC due to wind drift and other factors.</p><p></p><p>Bottom line: Find a bullet that shoot really good in your rifle that has the highest BC possible that maintains acceptable accuracy bearing in mind that the bullets with the highest BC's in your rifle might not shoot worth a crap.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 130662, member: 1007"] In alot of cases (all cases), differant bullets will have a differant BC for a given powder charge, load density, barrel length, twist rate, velocity, air density, and I am sure a few other things we havent discovered yet. It is almost always a waste of time to use the factories published BC for anything past 400-500 yards anyway. So you might as well just try differant bullets and figure out what they are dropping in what air density. Then cross referancing this real world data with a good ballistic calculator, you can come up with a real BC for your rifle/load combo. Published BC's are only an average based on a controlled enviornment and specifec barrel length/twist combo's. Trust me, it is no waste of time to fire away and figure out the real BC in the real world with your equipment. Also, if youre interested in using a particular bullet with no published BC and want a rough estimate, BC can be calculated. Please note that sometimes this will be close and sometimes it might be way off the mark. Most of the time, it will give you an idea based on physics. It takes a BC calculator to do this. These can be found in several ballistic calculators both PC and web based. It is also more important to have a bullet that shoots good in your rifle with a lower BC than one that shoots bad yet boasts a high one. Obviously this is to a point of balance as a really low BC will have a detrimental effect on overall performance at 1000 yards. At that point, sure 1 MOA 100 yard accuracy and a high BC would be better than 1/2 MOA 100 yard accuracy and a very low BC due to wind drift and other factors. Bottom line: Find a bullet that shoot really good in your rifle that has the highest BC possible that maintains acceptable accuracy bearing in mind that the bullets with the highest BC's in your rifle might not shoot worth a crap. [/QUOTE]
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ballistic coefficient on bullets
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