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Berger "Thick" bullets

 
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  #8  
Old 11-28-2008, 12:13 AM
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Re: Berger "Thick" bullets

Quote:
Quote:
Originally Posted by AZShooter View Post
I asked the same thing of Berger...."how will the heavy jacketed 180 7 mm VLD bullets perform on game?".

The answer was we don't know but we THINK they might not work as well.

Hopefully someone will post their results on game.
interesting... the gal I spoke to at Berger ADAMANTLY said that the thick jacket bullets were NOT designed for game. They were designed to overcome the issue of bullets coming apart in some cartridges and loads and should NOT be used on game. She was very adamant.
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  #9  
Old 11-28-2008, 11:24 AM
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Re: Berger "Thick" bullets

AZshooter,

My barrel is the Lilja 1-7 twist, 3 groove and 30" in 270 Cal.

Yours will be a good test, a very good test. I'm betting that the bullets won't come apart but may distort as the front begins to turn in the rifling and the base is still in the neck. The 150 270 VLD don't come apart w/the 7 twist but I'm confident that there would be no problems with a 10 twist but, who would want to be limited to a 150 grain bullet in a 270 Allen Mag. Surely not me!

I'll do some expansion test comparisons between the 168 VLD standard and thick versions. If that works out I'm going to reduce the diameter of the 168 and 180 thicks from 284 to 277. My luck will be or has been "Hmmm that didn't work". The "odds" are only slightly in my favor. Slightly is enough for me. Hey, its nothing but time and $$$:(.

If the diameter reduction doesn't work, I have a much better and more expensive plan "B". Plan "C" is out there but A and B will have to be tried in order. That's the order of lower cost, higher risk. Once thru A and B the largest investments will have been made and C will can be rationalized as a fairly inexpensive upgrade but way more hassle.:(
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  #10  
Old 11-28-2008, 10:39 PM
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Re: Berger "Thick" bullets

RoyinIdaho,

Very interesting! Going to reduce the dia of a 7mm 180 VLD to .277? That ought to need your 1 in 7 twist! Some sort of swaging?

If it works it might be interesting in reducing a 30 cal 200, 210 or 220 gr Sierra MK to 7 mm! I will be very interested in how that turns out!

Have you altered an existing bullet's diameter before?
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  #11  
Old 11-28-2008, 11:45 PM
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Re: Berger "Thick" bullets

Quote:
Originally Posted by azshooter View Post
royinidaho,

very interesting! Going to reduce the dia of a 7mm 180 vld to .277? That ought to need your 1 in 7 twist! Some sort of swaging? it should be right for th e7 twist.

if it works it might be interesting in reducing a 30 cal 200, 210 or 220 gr sierra mk to 7 mm! I will be very interested in how that turns out!

Have you altered an existing bullet's diameter before? nope, just another one of my wierd ideas born of necessity. However, its apparently been done by many others. The results are a bit iffy, i'm told. I'm also told that a reduction of 0.006" results in a +85% success rate. The extra 0.001 i need will be a bit iffier. But hey, i figure its worth a try. As was mentioned earlier can't go wrong except for time and $$.

i've already set up a bullet measuring system and have checked several brands of bullets for concentricity. Hopefully i won't have to to the level of a spinner' but if i have to i will seriously consider one.
1213456
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  #12  
Old 11-18-2009, 03:15 PM
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Re: Berger "Thick" bullets

Late up date,

Drawing the 7mm to 277 was a bust. 0.007 is just too much.

Gave up on the idea and gave the reducing die to a bullet maker to keep me from dabbling with it again.

However, I have purchased a lathe and ordered a first version jacket core reamer (what's the odds of the first design working?) as first the next step in development of a bullet jacket that will hold up to tough bore configurations and still give good LR terminal performance with a decent BC.

Received a PM from Azshooter that indicates I'm headed in the right direction. I just wish I knew whether I was on the pavement or out in the sage brush.
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  #13  
Old 11-18-2009, 04:09 PM
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Re: Berger "Thick" bullets

The thick jackets were created to solve the failure problem, which they have.
Since we haven't tested them for terminal performance, we can't know how they might perform, so it would be irresponsible for us to recommend them for hunting, or even say they're OK for hunting.

Since I know some of you guys like to live on the bleeding edge and you're working on things that the front line answers don't suffice, I'll offer the following additional information.

The thick jackets are thicker by about ~0.005" (more or less depending on caliber) in the bearing surface area. From the bearing surface to the mouth, the jackets have more taper than the standard (hunting) jackets, so that the thickness at the mouth is nearly the same as it is for the standard jackets.

What does that mean for expansion? One could assume (dangerous) that since the jacket thickness is close to the same at the mouth, that expansion would be initiated the same as it is for the standard jacket, but that the subsequent expansion/fragmentation could be less violent/excessive. Another way to say it is that the bullets might not provide enough expansion/fragmentation on long range, low velocity impacts as the standard jackets because the thicker jackets could hold the bullet together more.

Then again it's possible that the thicker jackets could prevent adequate expansion/fragmentation even at nominal/close range impact speeds. This is the possibility that we're afraid of, and it's why we can't advise them for hunting, which translates to advising against their use for hunting.

Jacket design is a classic trade-off between terminal performance on low velocity impacts vs survivability in high velocity / rough barrel applications. Reliable performance on low velocity impacts drives jacket thickness down, while survivability drives it up. The shooter who wants a bullet that survives 3400+ fps MV from a possibly rough barrel, and have that same bullet expand reliably on a long range shot where the impact velocity is 1800 fps or less is really asking a lot.

We're doing our best to understand and improve the design of jacketed hunting bullets in order to make the best bullets possible for as wide of a range of applications as possible. I see our current offerings of thick and thin jackets as a stepping stone toward a better solution. One shouldn't have to decide between high velocity survivability and low velocity terminal performance, but that's currently the situation.

Hope this sheds some useful light,
-Bryan
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Bryan Litz
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  #14  
Old 11-18-2009, 04:11 PM
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Re: Berger "Thick" bullets

Hey Bryan,

Just about to dive in on this one, but I see you've already addressed everything possible that I might have commented on!

Kevin Thomas
Lapua USA
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