Ballistic coefficient??

[Power Pill]

Im pretty new to the precision shooting game...
I downloaded a ballistic calculator for my phone and it asks for the ballistic coefficient of the round..
I'm not really sure how to come up with this number...
Could some shed some light for me?

Thanks

 

[arcticcathonda]

Most of the time its on the box of bullets. Otherwise Google the bullet and type bc into the search bar...

 

[SND]

Most bullet manufacturers website have the data, though some of them seem to use somewhat different means or standards to come up with their numbers eh.
Close enough to get on paper either way.

 

[9x19p]

It might be easier to list the bullet(s) or ammo you need info for.

 

[Power Pill]

It might be easier to list the bullet(s) or ammo you need info for.

Hornady .223 53 GR V-MAX are the rounds i'm using

 

[9x19p]

The bullet has a G1 BC of .290
Hornady Superformance 53gr Vmax list 3465 fps for velocity. (if this is what you're using)

Good luck

 

[Buckshot70]

http://www.hornady.com/store/223-Rem-53-gr-V-MAX-Superformance/

The G1 BC is .290

 

[saitek11]

If your takin this up its also an important number to understand. I did a little light reading about it when I learned and it has helped my understanding of this hobby greatly.

 

[notsorichguy]

Im pretty new to the precision shooting game...
I downloaded a ballistic calculator for my phone and it asks for the ballistic coefficient of the round..
I'm not really sure how to come up with this number...
Could some shed some light for me?

Thanks

Try the free version of isnipe.

It has most types of ammo and projectiles already in the app......

Another good one is bullet flight calc. It's worth the $30 for the full version!

Cheers!

 

[arcticcathonda]

G7 bc is best drag model for modern target bullets

 

[9x19p]

Iirc the 53gr Vmax is a flat base bullet, G7 is for boat tail.

 

[arcticcathonda]

Iirc the 53gr Vmax is a flat base bullet, G7 is for boat tail.

Thanks! should have made sure what we were discussing first!

 

[Toolman]

53 vmax is a boat tail bullet.

 

[Curt]

Some manufacturers inflate their BC numbers. I use them as a guideline and then use actual bullet strikes at distance to 'correct' my charts to try to ascertain a more accurate BC number. That is assuming that my chrono error is no too large. Long distance shooting is filled with variables that we often can't get absolute values for. There is always a 'fudge' factor.

 

[Shibby!]

Some manufacturers inflate their BC numbers. I use them as a guideline and then use actual bullet strikes at distance to 'correct' my charts to try to ascertain a more accurate BC number. That is assuming that my chrono error is no too large. Long distance shooting is filled with variables that we often can't get absolute values for. There is always a 'fudge' factor.

Bingo.

Manufactured values are rarely correct. Brian Litz's are far more accurate or you can work off proven tests to confirm the number being used.

 

[arcticcathonda]

I too like to use Litz's BC values and then true back out my true velocity. After all, it doesn't really matter what the chrony says, its all about results on target.

 

[Shibby!]

After all, it doesn't really matter what the chrony says, its all about results on target.

Chrono's have a pretty wild percentage of error. It's a tool and should not be considered concrete.

Working back off proven ballistics is a far better solution as you mentioned.