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New Book: "Applied Ballistics for Long Range Shooting"

 
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  #15  
Old 07-15-2009, 12:15 AM
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Re: New Book: "Applied Ballistics for Long Range Shooting"

Bryan,

I notice in the example you have @ http://www.appliedballisticsllc.com/...ookexample.pdf that the G7 BC has very little variation among velocities vs. the G1 BCs. Is that common? If so, it would seem to make even more sense to use the G7 BC for my ballistics calculations.

Thanks,
Jon
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  #16  
Old 07-15-2009, 11:39 AM
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Re: New Book: "Applied Ballistics for Long Range Shooting"

Thanks guys, for the support you've shown me on this book deal.

Quote:
I notice in the example you have @ http://www.appliedballisticsllc.com/...ookexample.pdf that the G7 BC has very little variation among velocities vs. the G1 BCs. Is that common? If so, it would seem to make even more sense to use the G7 BC for my ballistics calculations.
Jon,

Good observation.

To answer your question, yes. It is common for the G7 BC to have less variation with velocity compared to the old G1 BC for long range bullets.

Many good things happen as a result of minimizing the velocity variation of BC.

For one, it allows you to calculate more accurate trajectories and do more meaningful ballistic analysis.

For another thing, it allows you to make more valid comparisons between bullets based on BC without worrying what velocity the different BC's are based on.

Here is a link to some more in-depth material for those interested in understanding and applying the advantages of G7 referenced BCs:
Berger Bulletin Blog Archive A Better Ballistic Coefficient


It's clear from some previous posts, but I'd like to announce it anyway, that we're beyond the pre-order stage for the book: "Applied Ballistics for Long Range Shooting". I took delivery of 5000 copies from the printer last week (which filled a large portion of my garage!) and will now be shipping orders as soon as they're placed.



Thank you,
-Bryan
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Bryan Litz
Ballistician

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

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  #17  
Old 07-15-2009, 12:09 PM
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Location: Wampum, PA
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Re: New Book: "Applied Ballistics for Long Range Shooting"

Well worth it guys. I learned a ton in the first 20 some pages! That's saying something too since I'm mathematically and scientifically illiterate! Bryan really has made it readable for uneducated folks like myself! He's also presented the scholarly jargon for you guys that like headaches!
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"I may be dumb, but I'm not stupid." - Terry Bradshaw
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  #18  
Old 07-15-2009, 12:44 PM
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Join Date: Oct 2007
Location: Patagonia Mountains, Arizona
Posts: 754
Re: New Book: "Applied Ballistics for Long Range Shooting"

Quote:
Originally Posted by jonoMT View Post
Bryan,

I notice in the example you have @ http://www.appliedballisticsllc.com/...ookexample.pdf that the G7 BC has very little variation among velocities vs. the G1 BCs. Is that common? If so, it would seem to make even more sense to use the G7 BC for my ballistics calculations.

Thanks,
Jon
The G1 reference projectile is a flat base short ogive spitzer. The G7 reference eprojectile is a much more aerodynamic long ogive boattail bullet. If you're shooting 100 yard benchrest the popular bullets will be a better match for the G1 model. For 1000 yard plus shooting where wind deflection is the dominant source of shooting error most shooters chose long ogive boattails (VLDs) and those fit the G7 model better.

Why do most bullet manufactures only publsh the G1 BC number even for low drag boattails? Simple. Of all of the G() models the G1 reference projectile has the highest drag, therefore the G1 numbers are numerically higher. Other things being equal higher BC bullets sell better. Apparently the manufacurers think buyers are so dumb they'd go by the number alone. That may be true.

You cannot convert a G1 to a G7 BC by applying a constant or even a fixed function to the numbers. The relation of a bullets G1 and G7 BC is vs velocity changes with bullet shape.

Ideally the whole concept of BCs would be dropped and drag functions vs velocity provided for each bulllet instead. That would be very unwieldy to use with lookup tables and would require computer databases. It would give better trajectory predictions in todays world of personal computers. Even drag functions don't fully describe a bullets trajectory Ther are still stability factors vs velocity vs spin rate and second order effects beyond that.

WIll such databases every be generated and made available for download or sold on mass storage media by bullet manufacturers? Maybe if it imporoves sales (or more important, profit) but it takes considerable effort to measure or calculate the data accurately. Only a small part of the shooting community would care. Particulary in competitive shooting knowing a bullet's exact trajectory doesn't help much in trying to shoot smaller goroups or higher scores. With most manufacturers we're lucky to get a single G1 BC value for each bullet which is reasonably close at normal muzzle velocities. For most shooters that's good enough.

This website has drawings with the dimensions (in calibers) of the "G" reference projectiles:
http://www.frfrogspad.com/drgshape.htm

Last edited by LouBoyd; 07-15-2009 at 02:57 PM.
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  #19  
Old 07-15-2009, 02:24 PM
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Posts: 122
Re: New Book: "Applied Ballistics for Long Range Shooting"

Great info! I think I'll be getting this book...if Bryan has any copies left. There are a number of bullets listed that I use so I can at least get accurate G7 BCs for those - ones that have been uniformly tested using the same method by the same person.
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  #20  
Old 07-15-2009, 02:44 PM
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Re: New Book: "Applied Ballistics for Long Range Shooting"

Quote:
Great info! I think I'll be getting this book...if Bryan has any copies left.
Not to worry Jon,
Check out the view in my garage.


Turns out 5000 books takes up a lot of space,
Please help me get rid of them!

-Bryan
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Bryan Litz
Ballistician

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

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  #21  
Old 07-16-2009, 01:25 PM
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Join Date: Nov 2007
Posts: 122
Re: New Book: "Applied Ballistics for Long Range Shooting"

Two things, Bryan: Even with all those book boxes your garage is still cleaner than mine. Also, they take up more room than the 1200 3D posters of Mount Rainier that I still have. I could send you a poster along with my payment! (I sold the other 8800 over three years but printed 10000 since the price break was considerable).
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