Range Report Accounting for different BC’s as velocity slows

[SandLine]

I was looking up BC’s on Sierra’s website and noticed that they list three different BC’s depending on the velocity of the bullet at a given moment. For the ultimate in accuracy, are there any ballistic calculators that have the ability to factor in different BC’s at different velocities?

Or, has anyone experimented with creating three different drop charts for each BC, and then combining the drop data into one master chart?

 

[kraigWY]

Re: Accounting for different BC’s as velocity slows

I don't see how velocity changes the BC of a bullet to matter enough in reality, I mean if you look at the formular used to determing BC, it dosnt show up. I dont think velocity makes anythig more or less accurate. At least I've never seen it on my targets.

C = w/(id squared)

C = Ballistic Coefficient
I = Form factor
d = diameter of the bullet

 

[Swan]

Re: Accounting for different BC’s as velocity slows

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SandLine</div><div class="ubbcode-body">I was looking up BC’s on Sierra’s website and noticed that they list three different BC’s depending on the velocity of the bullet at a given moment. For the ultimate in accuracy, are there any ballistic calculators that have the ability to factor in different BC’s at different velocities?

Or, has anyone experimented with creating three different drop charts for each BC, and then combining the drop data into one master chart?</div></div>

use G7 BC's instead. Bryan Litz is a wealth of info on this subject.
http://www.appliedballisticsllc.com/index_files/Book.htm

 

[SandLine]

Re: Accounting for different BC’s as velocity slow

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Swan</div><div class="ubbcode-body">use G7 BC's instead. Bryan Litz is a wealth of info on this subject.
http://www.appliedballisticsllc.com/index_files/Book.htm </div></div>


I just did a little research on G7 BC's; great call on your part. Thanks.

 

[azimutha]

Re: Accounting for different BC’s as velocity slow

G7 avg. BC has significantly less standard deviation over velocity range. So using one number works.