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Bullet BC's

 
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  #1  
Old 11-25-2012, 03:02 AM
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Bullet BC's

I have been reading about bullet bc's and have noticed in several articles that I have read that people have also quoted G7BC or G1BC, what do these mean compared to BC's that I have looked at on boxes of bullets or on web sites from ammunition manufactures?
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  #2  
Old 11-25-2012, 07:58 AM
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Join Date: Feb 2011
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Re: Bullet BC's

Generally the bc's listed are g1. Most if the time if it is a g7 bc it will say so. I am no expert so if I am wrong about this someone correct me. From my understanding g1 is based off flat based bullets which when using high bc bullets such vld's will not always compute right. G7 is based off of new boat tail designs. The reason most manufacturers still post g1 bc's is for the apaerance of a much higher bc. For example a .277 150gr hunting vld list a .531 g1 bc or a .272 g7 bc. You can also go to betters website they have a page on the diff.
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  #3  
Old 11-25-2012, 10:00 AM
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Re: Bullet BC's

Quote:
Originally Posted by wnc-coyote View Post
Generally the bc's listed are g1. Most if the time if it is a g7 bc it will say so. I am no expert so if I am wrong about this someone correct me. From my understanding g1 is based off flat based bullets which when using high bc bullets such vld's will not always compute right. G7 is based off of new boat tail designs. The reason most manufacturers still post g1 bc's is for the apaerance of a much higher bc. For example a .277 150gr hunting vld list a .531 g1 bc or a .272 g7 bc. You can also go to betters website they have a page on the diff.
You got it right. G1 being a modeled on a flatbased spitzer, and G7 being modeled on a boat tail spitzer. Each base (meaning basic bullet design not referring to the base of the bullet) design behaves differently in regards to exterior ballistics.
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Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
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  #4  
Old 11-25-2012, 12:26 PM
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Re: Bullet BC's

Berger Bulletin A Better Ballistic Coefficient
https://en.wikipedia.org/wiki/External_ballistics
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  #5  
Old 11-25-2012, 10:16 PM
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Join Date: Aug 2011
Location: Washington
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Re: Bullet BC's

Thanks everyone for the great information. I will look into this more with the knowledge that has been passed on and see what the actual BC's are on the bullets that I have been shooting up to this point and if I will be looking to keep them around or change.
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  #6  
Old 11-26-2012, 07:18 AM
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Re: Bullet BC's

Shedhunt, note also that while Sierra Bullets' uses several BC's for a given bullet at different velocities through air based on their G1 standard, Berger uses only one based on their G7 standard. This may cause some confusion when comparing bullets from each maker to each other.
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