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Berger Bullets' Move To The G7 Standard BC By Bryan Litz

 
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  #8  
Old 07-22-2009, 07:42 AM
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Re: Berger Bullets' Move To The G7 Standard BC By Bryan Litz

This "magazine" is getting quite good.

It's nice to be around the fire when the paradigm changes.

I've done some drop chart development that took a bit of fudging w/G7 bc option to get things right. Now I know why.

Good article in a great magazine.
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  #9  
Old 07-22-2009, 08:11 AM
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Re: Berger Bullets' Move To The G7 Standard BC By Bryan Litz

Eaglet,
We'll be printing both G1 and G7 on the labels for a while. As you said, introducing this new data is daring enough, to immediately abandon the old familiar safety net would be too abrupt. These things take time. Thanks to forums like this, the information can flow quickly and expedite the 'wholesale' switch to something better.
-Bryan
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  #10  
Old 08-01-2009, 09:23 AM
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Re: Berger Bullets' Move To The G7 Standard BC By Bryan Litz

Bryan, very good article! You have struck my need to know more nerve. So I ordered your book and will read it more than once to let it all sink in. After soaking up as much as possible, I Will need some soft wear to apply what I have learned. This is were the chooses get confusing. I have done some research, on most of the popular soft wear programs.With the exception of JBM,(witch is web based) None of these products state witch BC standard they use. Is there a way to list the soft wear that uses all of the BC standards?

Regards Mike.
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  #11  
Old 08-01-2009, 03:24 PM
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Re: Berger Bullets' Move To The G7 Standard BC By Bryan Litz

Yet another reason reason to choose Berger, and why they are my go to brand anymore. A gun has to first show it just won't shoot Bergers for me to go fool with another brand.

Bryan: Great article and I will order the book soon. In the meantime is there any chance you could post a list of the bullets included in the book? Not the BCs of course just a list so we know what is included?
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  #12  
Old 08-01-2009, 04:02 PM
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Re: Berger Bullets' Move To The G7 Standard BC By Bryan Litz

Mike,
Thanks for the compliments and for ordering the book.
As far as what software programs use G7, well, the one that comes with my book does. Also, some of the programs that are free for download from the JBM site use G7. AlBal is one I remember in particular. If you want to pay for a more inclusive program, I know LoadBase and the RSI software programs have an option for G7 as well. I'm sure there's others but I don't have them all on top of my head. It would be a good idea to compile a list.

Forester,
The question was asked on another thread, you can see the list of bullets here:
New Book: "Applied Ballistics for Long Range Shooting"

It's post #5 in the thread.

Take care guys,
-Bryan
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  #13  
Old 08-15-2009, 11:55 AM
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Re: Berger Bullets' Move To The G7 Standard BC By Bryan Litz

Hi Bryan,

Do have to take exception to one portion of this piece; the comment about the industry utilizing the G1 drag model simply because it results in the highest numerical values. In other words, a marketing ploy. As long as we have every one's attention here, I'd like to reaffirm the fact that the universal use of the G1 drag model is one of expediancy (okay, laziness) , not a marketing strategy. Until relatively recently, very few shooters had any concept or underestanding of BC. Sadly, based on the Shooting Times comments about the BCs being based the .50 BMG round, many gunwriters still don't. It was nothing more than a quick and lazy way for manufacturers to compare a diverse spectrum of bullets with the minimal amount of work. What is called for here is that each bullet be used with the proper drag model appropriate to that bullet, be it a G1, G2, G5, GL or the G7 or any of several others. As you know (and others should understand), the G1 is not an appropriate drag model for the .30 cal 170 FN for a .30-30. Neither is a G7. I don't have Lowery's text in front of me here, but there is a drag model specific to flat-based, flat (or blunt) nosed projectiles. That's what should be used, but for a 75 yard shot from an iron sighted M94, does it really make a huge difference? Most of the Lyman pistol designs should properly use the GL model, but like the M94 example, we're talking about some pretty finely split hairs here.

Berger has an advantage in this field, in that the vast majority of the line is appropriate to the G7 model. A bit more difficult for a company that produces a range of round noses, flat noses, hollow point pistol bullets, etc.. In that respect, Berger is the perfect company to step up to this particular plate, and I'm truly glad to see you do it here. The time is right; we now have the range of computer programs that make this subject more accessable to a wider range of shooters than ever before. Forums like this allow for a great exchange of info between (frankly) a more advanced group of shooters, than presented by the mainstream gun rags and their more generalized audiences.

I think even with the aforementioned ballistics programs, we're still a long ways off from listing and using the correct drag model/table for each type of bullet. Still, the thorough explanation of the G7, and its applicability to the streamlined BT bullets used in Long Range competition is a major step forward in this regard, and I applaud you and Berger for daring to enter the fray. It's a start, and a damned good one.

Keep it up, Bryan, you're performing a real service here!
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  #14  
Old 08-15-2009, 04:47 PM
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Re: Berger Bullets' Move To The G7 Standard BC By Bryan Litz

One of the first things that should be made apparent to anyone trying out a ballistics calculator is to select the proper drag model. I don't know if a different drag model would provide a similar lack of BC deviation for a non-VLD that the G7 model does for VLDs, but it's all I'm using now for bullets that fit that model.
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