Ballistic coefficient is nothing more than how aerodynamic a bullet is.
The higher the B.C.# is the more aerodynamic the bullet is.
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BC stands for ballistic co-efficient, basicly its a measurement of how well a bullet slips through the air, just shooting high BC bullets will cut your drop and drift by as much as 30% at very long range.
an ultra high BC is around 1, .6 is very good. it has alot to do with point shape and length for caliber, this is why the really high BC bullets are heavy for caliber and long for the bullet diameter.
Thats why I say in the world of long range shooting BC outruns velocity every time.
RR
another note that may be of interest, take any 2 bullets of the same BC, regardless of weight or diameter, if started at the same velocity they drop and drift the same.
RR
I'll add that BCs are based on, and compared to a "standard projectile." There are several SPs, though G1 is just about the only one published by bullet makers. G7 SPs are slowly gaining popularity because their shape is similar long-range bullets (long, pointed tip and boat tail) and can give more accurate results in calculators..
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another note that may be of interest, take any 2 bullets of the same BC, regardless of weight or diameter, if started at the same velocity they drop and drift the same.
RR
So take for example a 130 grain 270 bullet. How much of a range of BC would their be across bullets available (guess??). i.e. how much difference is between the high and low end? What does something like that translate into drop and drift wise?
normaly bullets listed as "vld" (very low drag) or uld (ultra low drag) have the highest BC's like the bergers, hornady a-max's and the sieera match kings.
Here I've ran some numbers with a 270 win. shooting 2 150 gr bullets both at 2900 fps, an extreme example but you can see the difference more clearly. so sighted dead on at 200 yds for both
bullet 1 is a hornady 150 gr roundnose with a bc of .269
200 0
300 -9
400 -27.3
500 -58.2
600 -105.9
700 -175.9
now a berger vld 150 gr with a bc of .531
200 0
300 -7
400 -20.1
500 -40.6
600 -68.6
700 -106.5
so changing nothing but bullet shape can give you over 5 feet less drop at 700 yards, wind drift is affected the same. hope this helps
RR
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Last edited by Ridge Runner; 01-24-2010 at 04:55 AM.
so as you can see by the drop chart above to compensate for a 600 yard shot with the 150 gr RN it would take almost 17 MOA of up to make a 600 yard zero
using the 150 berger it would only take 14.5 MOA of elevation to make zero at 700 yards, so you just extended the range by 100 yards, with 2.5 MOA less adjustment needed, all from a better designed bullet for that type of shooting.
Now I have custom bullets that are pushing right at a .9 BC, but they have to be fired from a non-standard twist barrel in most chamberings however they will work in the 7mm RUM and 7mm STW chamberings with a standard twist.
RR
Could someone explain ballistic coefficient?
