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Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet

 
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  #57  
Old 02-26-2012, 02:19 AM
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Re: Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet

Those are incredible additions, Bob. That single addition to .270 could very well replace the 30.06 as the the premier mid caliber round for many hunters. Me for instance. What factory ammo might be available re muzzle velocity?
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  #58  
Old 02-26-2012, 12:11 PM
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Re: Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet

McMillan built me a 270 WSM in my EOL specs just like the ones we are currently using. We have evolved a couple times on the rifles we are shooting for the show. You guys haven't yet been able to see them because the production lag time is almost 9 months or better in some cases. However this next season of EOL TV starting late June you will see them and it will make sense.

We are using a particular low BSC (bearing surface compression) barrel that we know works very well with the Berger bullets. In the 270 WSM we are getting approx 3000-3050 fps. Anything over 3000 fps will carry the magical 1800 fps at 1000 yards we like to see.

In the long run EOL and Berger will be partnering on a brass line to go with these crazy heavy/ high B.C. Bullets to get even more performance. But before I get the cart ahead of the horse, we have to stay focused on getting the bullets out there.
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  #59  
Old 02-27-2012, 03:13 PM
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Re: Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet

Bob - I really like the show. But please, no more buffalo with the Bergers. I found that episode very traumatic. ;-)
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  #60  
Old 02-28-2012, 06:00 AM
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Re: Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet

Quote:
Originally Posted by Bob Beck View Post
McMillan built me a 270 WSM in my EOL specs just like the ones we are currently using.
We are using a particular low BSC (bearing surface compression) barrel that we know works very well with the Berger bullets. In the 270 WSM we are getting approx 3000-3050 fps. Anything over 3000 fps will carry the magical 1800 fps at 1000 yards we like to see.
Could you please kindly advise the effective impact velocity range for the new EOL Hybrid Hunting bullets, both the 7mm 195 gr EOL and the 170 gr270 caliber?
ie 2500fps-1400fps impact range?
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  #61  
Old 02-28-2012, 08:04 AM
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Re: Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet

What is a "Bearing Surface Compression" barrel ?
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  #62  
Old 02-28-2012, 08:50 AM
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Re: Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet

Of the guns I own, I never even considered barrel twist and how would I determine what they are? Are the higher twist rates a modern phenomenon? If I purchased a gun 30 years ago is it likely that the twist rate is 13 or 14?
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  #63  
Old 02-28-2012, 10:04 AM
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Re: Berger to introduce 7mm 195 gr EOL Hybrid Hunting Bullet

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Originally Posted by JimBoIHN View Post
Of the guns I own, I never even considered barrel twist and how would I determine what they are? Are the higher twist rates a modern phenomenon? If I purchased a gun 30 years ago is it likely that the twist rate is 13 or 14?
Rifling is used to impart spin onto the bullet so as to maintain gyroscopic stability. ...like throwing a nice spiral football pass.

If the spin is too slow, imperfections in the bullet will lead to inaccuracies or even tumbling.

If it's too fast, then the bullet won't travel optimally either and impact may not be perfectly head on, but it's usually better to spin a bit too fast than too slow.

Over the last few decades significant improvements in bullet construction, powders, optics, laser range finders, ballistics software, etc... have led to a lot more bullet choices in the long, heavy, VLD, boat tail designs with much improved BCs for better long range accuracy especially in windy conditions.

Previously, the long bullets may not have held together when spun at the required twist rate/velocity. This can still be a problem today with the longest bullets and biggest magnums. In extreme cases, you can shred the jacket as it leaves the barrel.

So, yes. There has been a trend towards slightly faster twist rates even in some factory barrels. But, especially in aftermarket custom barrels.

Most modern factory barrels will shoot a wide range of bullets. But, the "heavy for caliber" bullets often require a faster twist than the average factory barrel.

You can measure your twist rate. There are articles and threads here explaining. Barrel mfgs often post guidelines on twist rates for calibers. And, JBM Ballistics has a website for calculating stability. If you still need help, post a thread and someone will explain.

Hope this helps!
Richard
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