7mmShooter
Well-Known Member
Len actually states a BC figure as well... Time will tell where it lands but I'm betting it will be between Len's figure and the .794 G1 that has already been stated
Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet
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Len actually states a BC figure as well... Time will tell where it lands but I'm betting it will be between Len's figure and the .794 G1 that has already been stated
Why do you think the .755 stated by Len is not correct? Wouldn't that number have come from Berger's testing?
MudRunner2005
Well-Known Member
All of Berger's BC's are determined by Bryan Litz, who is a professional ballistician. I trust Bryan's initial testing will land us somewhere near the mark. The initially tested G1 BC was .794, and the initially tested G7 BC was .406. That info is straight out of an email Berger sent me in May of 2014.
MudRunner,
I appreciate your confidence in me, however I need to clarify.
The BC's we were talking about for this bullet prior to it being made were all estimates because the bullets weren't available for testing at that time.
Now that the bullets have been made, I've actually tested them for BC. The actual tested performance is:
G1 BC = 0.755 (Average from 3000 to 1500 fps)
G7 BC = 0.387 (Valid for all speeds)
This is like 5% lower than initially predicted but still very high. To put it in perspective, the form factor (drag) is as low or lower (splitting hairs) as any Berger Bullet, and the BC is 4% higher than the .30 cal 230 grain.
More info to come soon.
-Bryan
I appreciate your confidence in me, however I need to clarify.
The BC's we were talking about for this bullet prior to it being made were all estimates because the bullets weren't available for testing at that time.
Now that the bullets have been made, I've actually tested them for BC. The actual tested performance is:
G1 BC = 0.755 (Average from 3000 to 1500 fps)
G7 BC = 0.387 (Valid for all speeds)
This is like 5% lower than initially predicted but still very high. To put it in perspective, the form factor (drag) is as low or lower (splitting hairs) as any Berger Bullet, and the BC is 4% higher than the .30 cal 230 grain.
More info to come soon.
-Bryan
I don't know what your email says but I did read the first post in this thread.
Twist requirements will vary depending on MV and your altitude, temp, etc.
Best to use the Berger stability calculator to determine true stability for your conditions:
Twist Rate Stability Calculator | Berger Bullets
The bullet is 1.648" long.
-Bryan
Best to use the Berger stability calculator to determine true stability for your conditions:
Twist Rate Stability Calculator | Berger Bullets
The bullet is 1.648" long.
-Bryan
MudRunner2005
Well-Known Member
Thanks for the correction Bryan. I took the initially posted BC's as you had tested some of the prototypes. But, good to now know the real-world BC's.
Thanks for the reply.
7mmShooter
Well-Known Member
MudRunner2005
Well-Known Member
Same here. I thought that might have been an independent assessment. The initially figured BC's were the only numbers I had heard up until today.
7mmShooter
Well-Known Member
Come to think of it, I wonder if we'll see it in the ABM ammo line or the EOL ammo line. It would be a good match to the 230 Hybrid 300WM load.
How long before the complete dimension specs are posted somewhere?
Danny1788
Well-Known Member
http://forum.accurateshooter.com/index.php?action=dlattach;topic=3878807.0;attach=960024;image
This was posted on the 6mm br forum aka accurate shooter.
This was posted on the 6mm br forum aka accurate shooter.
That's the original drawing. I've had that one saved in my laptop for a couple of years. The length of the actual bullet is slightly different from that drawing. I wouldn't be surprised if there were some other differences as well.
