G7 BC for .223 projectiles

[JohanH]

Good day,

Can anyone help me out with the G7 BC for the following .223 projectiles:

Hornady 80gn A-Max
Sierra 80gn MatchKing
Nosler 80gn Custom Competition

Many thanks,

JohanH
Sydney

 

[flatlander]

H 80 AMax = .231
S 80 MK = .217
From Byran Litz's Applied Ballistics For Long Range Shooting
He doesn't list the Nosler 80 - it's so similar to Sierra's 80 that one could safely use that bullet's BC and be very close.

Byran invested a lot of time & effort into deriving these BCs, and included a tremendous amount of very good information in the book - I strongly recommend it to anyone interested in LR shooting.

 

[kentuckytroutbum]

Yes, Litz's book is outstanding. Via e-mail, he and I had a lengthy discussion about G1, G5, and G7 drag profiles for various bullets. He recommended his book, of course, and said that he was still evaluating BC on other bullets.

However, he spoke highly of using JBM's ballistic program, and also the BC converter to go from a G1 to a G7 drag profile for imput. Note: this was prior to Berger releasing their own ballistic program, which I have subsequently used.

It you haven't downloaded Berger's program, you can always use JBM's program, and it is still free. I've found JBM to be very accurate in predicting downrange bullet drop and windage corrections for the rifles that I own and shoot competitively.

 

[JohanH]

Greatly appreciate the feedback. Will look into getting a copy of Bryan Litz's book.

Johan.