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#7172596 - 05/17/18 06:39 PM Stability of two bullets
scdogman Offline
Bird Dog

Registered: 11/12/10
Posts: 256
I run the 162 eldx in a 7mm around 2950. FPS 9.5 twist.
The bullet is 1.478 inches long.

On paper the180 eld-m is very close to the same stability.

1.54 inches long. Both have a tip length around .14 inches. Letís use 2800 FPS.

I find both stable above 7200 FT.

At 575 ft they are close.


Can someone run the numbers and tell me what Iím missing.

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#7172708 - 05/17/18 08:14 PM Re: Stability of two bullets [Re: scdogman]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 23487
Loc: Texas
What are you running the numbers on? I use the one on Berger webpage, you can put in yout bullet or select from Berger bullets.

http://www.bergerbullets.com/twist-rate-calculator/
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#7172797 - 05/17/18 09:15 PM Re: Stability of two bullets [Re: scdogman]
scdogman Offline
Bird Dog

Registered: 11/12/10
Posts: 256
When I use Bergers they are very close. When I use jbm they are close as well.

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#7172800 - 05/17/18 09:18 PM Re: Stability of two bullets [Re: scdogman]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 26052
Loc: Wolfe City, TX
Uh, what cartridge?
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#7172822 - 05/17/18 09:43 PM Re: Stability of two bullets [Re: scdogman]
scdogman Offline
Bird Dog

Registered: 11/12/10
Posts: 256
7mm rem mag, .284


Edited by scdogman (05/17/18 09:44 PM)

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#7172825 - 05/17/18 09:43 PM Re: Stability of two bullets [Re: FiremanJG]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 23487
Loc: Texas
Originally Posted By: FiremanJG
Uh, what cartridge?


I am guessing the 7mm Nosler
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#7172949 - 05/18/18 06:35 AM Re: Stability of two bullets [Re: scdogman]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 26052
Loc: Wolfe City, TX
69.0 gr + of H-Retumbo and they might be alright. Berger calls for a 1:9 to stabilize 180's, and I use a 1:8.5
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#7173138 - 05/18/18 10:19 AM Re: Stability of two bullets [Re: scdogman]
ChadTRG42 Online   happy
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Registered: 09/16/09
Posts: 13513
Loc: Lewisville, TX
Running the numbers you gave, the 162 ELDX is 1.34 stable on the Berger calculator. This is fine. Berger used to use 1.4 as the cut off line for bullet stability, but changed it to 1.5. At 1.34, you are fine for stability, but the BC will be slightly reduced.

On the 180 ELDM, I'm showing 1.3 stability factor, with a 6% loss of BC. This is still fully stable, just not as stable if you were running a 1:9" or 1:8" twist. But, with the super high BC of 180 ELDM and a 6% loss of BC, it's still a better option than a 162 for drop and wind drift at longer ranges (700+ yards). If you will be primarily shooting inside of 600 yards, I'd lean tot he 162 grain. If you are wanting to shoot majority of distances further than 700+, the 180 would work well.
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#7173140 - 05/18/18 10:20 AM Re: Stability of two bullets [Re: scdogman]
scdogman Offline
Bird Dog

Registered: 11/12/10
Posts: 256
Not looking for a load or powder recommendations. Asking someone to run the numbers and tell me if the stability numbers are close.

Every thing I find says yes. Since I already shoot the 162, the 180s shoot fly without problems.

I guess itís moot now. I loaded some last night to shoot at 300 yards. I will see if they tumble today.

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#7173142 - 05/18/18 10:21 AM Re: Stability of two bullets [Re: scdogman]
scdogman Offline
Bird Dog

Registered: 11/12/10
Posts: 256
Thanks Chad. You posted as I was typing.

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#7185629 - 06/01/18 09:57 AM Re: Stability of two bullets [Re: scdogman]
scdogman Offline
Bird Dog

Registered: 11/12/10
Posts: 256
Shot the 180s out to 1000 yards. They flew pretty good.

This is in a factory savage with the 9.5 twist. Speed was in the mid 2800s.

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