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Ballistic Coeficient G1 or G7

 
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  #8  
Old 05-03-2012, 09:25 AM
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Re: Ballistic Coeficient G1 or G7

I find it hard to believe after reading most of his book that with a boat tail bullet you will get more consistent results with G1. I would be willing to bet that you are not inputting the correct items.

If you think about it, use the model that looks like your bullet, G1 looks like a Pistol FMJ bullet, whereas the G7 looks like a Lapua Scenar.

Check your inputs.
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  #9  
Old 05-03-2012, 09:46 AM
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Re: Ballistic Coeficient G1 or G7

Quote:
Originally Posted by Mikecr View Post
Hopefully your not using a G1 BC with the program setting at G7.
G7 BC should lower than G1 BC.
I'm using 168gr SMKs .308 BC of .462 and Nosler BT 165gr BC of .490. So what would the G7 BC be?
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  #10  
Old 05-03-2012, 01:38 PM
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Re: Ballistic Coeficient G1 or G7

according to bryan litz
168 smk g7 is .218 g1 is .427


the nosler 165 balistic tip
g7 .227
g1 .444

use the G7 that i have given you, they were tested by Mr. Litz himself rather than computer generated.

Those were Average BC's from 1500 - 3000 fps i believe. That will get you VERY close on almost ANY shooting situation. If you need more precision id reccomend buying his book and it has all that information in it.


I feel bad giving any more information that that, as the guy worked hard on the book and provides it for dirt cheap.
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  #11  
Old 05-03-2012, 02:07 PM
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Re: Ballistic Coeficient G1 or G7

Quote:
Originally Posted by kc0pph View Post
according to bryan litz
168 smk g7 is .218 g1 is .427


the nosler 165 balistic tip
g7 .227
g1 .444

use the G7 that i have given you, they were tested by Mr. Litz himself rather than computer generated.

Those were Average BC's from 1500 - 3000 fps i believe. That will get you VERY close on almost ANY shooting situation. If you need more precision id reccomend buying his book and it has all that information in it.


I feel bad giving any more information that that, as the guy worked hard on the book and provides it for dirt cheap.
Brian states in his book that the 168SMK has an inherent stability issue at ranges greater than 700 yards or so. It is a design flaw with of the bullet. Also, the Ballistic tip, due to the short boat tail, may behave more like a G1 then a G7. I use this 165gr. bullet in my 308 at 2800 fps and get very accurate trajectory results using G1.
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  #12  
Old 05-03-2012, 07:04 PM
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Re: Ballistic Coeficient G1 or G7

Just to clarify above I have never shot either of these bullets, and maybe have shot 5 30 cal rounds in my life

Just took it from the book, shout of said above that i have no experience with either of these bullets (or the caliber for a matter of fact :P)
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  #13  
Old 03-16-2013, 11:01 PM
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Re: Ballistic Coeficient G1 or G7

My brother just bought a kestrel 4500 with a trac .. it just uses a g1 bc .. no input for a g7.. spot on at 550yards and 750 but i had to adjust my fps a littel bit.
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  #14  
Old 03-17-2013, 08:01 PM
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Re: Ballistic Coeficient G1 or G7

I was wondering the same thing. I was playing with shooter on my phone and with data for my 338 edge, using the g1 it says come up 25.1 and the g7 says 21.1. Any help?
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