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7MM Berger Conundrum

 
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  #1  
Old 04-09-2012, 11:40 PM
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7MM Berger Conundrum

168 vs. 180 berger bullets?

I have been playing with Load From a Disk with a 7x300 Wby Mag. I have 1 box of 168 and 1 box of 180gn. I will be using H-870 powder (Over 100FPS gain over other powders).

The picture attached shows bullet drop of Load From a Disk's MAX loads for the caliber. It goes out to 2000 Yards. The 168 shoots flatter even out to those distances. The Energy is pretty much the same.

So those of you shooting the 180's why are you shooting them? What Am i Missing? The ability to buck the wind should also stay consistent with Bullet drop as that is Velocity and BC.

It shows 54 MOA drop of the 168 at 2000 yards vs 57 MOA drop at 2000 Yards, so they seem identical. But do you want to spend the extra powder in the 168's to get a slightly flatter shooting bullet?
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File Type: bmp 168(Red) vs 180 (Blue).bmp (636.1 KB, 0 views)
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Old 04-09-2012, 11:58 PM
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Re: 7MM Berger Conundrum

were is your graph on wind?
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Old 04-10-2012, 12:08 AM
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Re: 7MM Berger Conundrum

I have shot the 168s and this weekend loaded up some 180s to try and I was surprised by the increase in felt recoil with the 180s. I also did not lose as much velocity as I thought I would by going up to the 180s. When I was looking at drop figures, the 168s were slightly flatter, but the 180s had slightly less wind drift. I was assuming a 100 fps drop in velocity for the 180s and my actual lose in velocity was only around 70 fps. I think I will be sticking with 168s for shooting ease unless I find the 180s shoot a lot better. This was out of a 7mm Dakota.
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Old 04-10-2012, 12:16 AM
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Re: 7MM Berger Conundrum

that was my next ? witch ones shot better.
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Old 04-10-2012, 12:17 AM
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Re: 7MM Berger Conundrum

231 inches with 168 and 228 with 180 so the 180 will buch a 10mph wind slightly better, but 3" at 2000 yards is not much.. The Graph for the wind is attached.
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File Type: bmp Wind Vs Range.bmp (636.1 KB, 0 views)
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Old 04-10-2012, 12:31 AM
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Re: 7MM Berger Conundrum

Quote:
Originally Posted by Booney View Post
that was my next ? witch ones shot better.
Conditions were not the greatest, so I did not get a great feel for how they are going to shoot compared to the 168s. The 168s are definitely more pleasant to shoot and I was not expecting to notice a difference.
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  #7  
Old 04-10-2012, 09:03 AM
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Re: 7MM Berger Conundrum

Here's some further information on those two bullets:
http://www.appliedballisticsllc.com/...mNumberOne.pdf
http://www.appliedballisticsllc.com/...mNumberTwo.pdf

The analysis focuses on NRA style target shooting but the ballistics are the same regardless of the target.

-Bryan
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Bryan Litz
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Author of: Applied Ballistics for Long Range Shooting
And: Accuracy and Precision for Long Range Shooting

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