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195 grain 7mm Berger - How Much Cartridge Will it Need?

 
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  #15  
Old 12-11-2013, 10:27 AM
Edd Edd is offline
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Re: 195 grain 7mm Berger - How Much Cartridge Will it Need?

Santa Clause, the Tooth Fairy, the Easter Bunny, and Berger 195 gr 7mm Bullets.
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  #16  
Old 12-11-2013, 10:34 AM
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Re: 195 grain 7mm Berger - How Much Cartridge Will it Need?

Quote:
Originally Posted by Edd View Post
Santa Clause, the Tooth Fairy, the Easter Bunny, and Berger 195 gr 7mm Bullets.
Pretty much how I feel about it...
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The 284 is to the STW what a tricycle is to a Ninja.
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Old 12-11-2013, 10:57 AM
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Re: 195 grain 7mm Berger - How Much Cartridge Will it Need?

I must be looking at something incorrectly on the calculator then?

Twist Rate Stability Calculator


Use this form to determine your gyroscopic stability factor (SG) based on the Miller Twist Rule

Input Parameters
Caliber .284
Bullet Weight 195 Grains
Bullet Length 1.5
Barrel Twist 9 Inches/Turn
Muzzle Velocity 3000
Temperature 59
Altitude 4500 Feet



SG = 2.01

Not saying that you will not need a 8.5 or 8 twist to stabilize, I am just asking.

Is there any reason not to run that fast of a twist rate, i.e. would it make lighter bullets come apart easier at higher MV's due to the increased RPM's leaving the barrel?
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Old 12-11-2013, 11:05 AM
Edd Edd is offline
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Re: 195 grain 7mm Berger - How Much Cartridge Will it Need?

Quote:
Originally Posted by joeycoates View Post
I must be looking at something incorrectly on the calculator then?

Twist Rate Stability Calculator


Use this form to determine your gyroscopic stability factor (SG) based on the Miller Twist Rule

Input Parameters
Caliber .284
Bullet Weight 195 Grains
Bullet Length 1.5
Barrel Twist 9 Inches/Turn
Muzzle Velocity 3000
Temperature 59
Altitude 4500 Feet



SG = 2.01

Not saying that you will not need a 8.5 or 8 twist to stabilize, I am just asking.

Is there any reason not to run that fast of a twist rate, i.e. would it make lighter bullets come apart easier at higher MV's due to the increased RPM's leaving the barrel?
In your other post you said any altitude. To me, any altitude would include sea level.
Using 4500 feet will make some difference. The other difference is, you are not using the correct bullet length. The correct length is 1.637".
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  #19  
Old 12-11-2013, 11:50 AM
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Re: 195 grain 7mm Berger - How Much Cartridge Will it Need?

Yea, I had to guess on length as I have not seen the actual length anywhere. I know that it will make a difference.
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  #20  
Old 06-11-2014, 07:34 PM
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Re: 195 grain 7mm Berger - How Much Cartridge Will it Need?

You may want to give the 190 gr Matrix a try.
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  #21  
Old 06-12-2014, 05:55 AM
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Re: 195 grain 7mm Berger - How Much Cartridge Will it Need?

7mm/26 Nosler!

Well that's my story and I'm sticking to it.

IMHO a STW, WSM, Dakota, Allen, 7mm/375 Ruger or a 284/7mm/26 Nosler is probably where you want to go.

I don't think a 284 Win or AI or a 280 Rem or AI will hunt the way you would want.
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