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Quest for g7 ballistics programs (can we please make a list)

 
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  #1  
Old 08-20-2009, 04:32 PM
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Quest for g7 ballistics programs (can we please make a list)

I'm still not sure which program to get. I know that it needs to have the OPTION for using the G7 drag function. Not all programs state weather they do. Can you help compile a list of ballistics programs, that use G7. And weather they are PC, PDA(Pocket PC), Windows based, or Apple based.

Your help would be greatly appreciated by my self, and others, that are about to go down this road.

Regards : Mike
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Old 08-21-2009, 01:14 AM
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Re: Quest for g7 ballistics programs (can we please make a list)

RSI uses G7


Ballistics Software, Chronographs & Pressure Instruments For Shooters
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Old 08-21-2009, 07:07 AM
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Re: Quest for g7 ballistics programs (can we please make a list)

Great Idea Mike.

I'll add the one's I know of. As others post new ones below, I'll update this list so that they're all compiled in one place.

JBM (free; online)
RSI ($99.95; PC)
Point Mass Ballistics ($39.95; PC) this is the one that comes with my book
Al Bal (free; PC) Download-able from JBM site
BulletFlight (~$12; iPhone app)
Ballistic ($10; iPhone app)
LoadBase 3 ($148.50; PC and PPC)

I've been talking to Gerald Perry about adding G7 capability to Exbal. I don't know if he'll do it, he was talking about another program that he's working on that will have G7 though. I'm sure the more pressure he gets from customers the more likely he would be to consider adding G7 to Exbal.

-Bryan
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Last edited by bsl135; 09-11-2009 at 06:26 AM. Reason: re-added LoadBase(3) to the list of G7 capable software
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Old 08-21-2009, 09:09 AM
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Re: Quest for g7 ballistics programs (can we please make a list)

It seems to me that writing new programs whch use G7 BCs is a step in the wrong direction. All of the data for complete drag vs velocity tables for or every bullet made would fit on one DVD and take only a small portion of the hard drive space on a modern laptop computer. Why not dump the use of BCs completely? Didn't the US Army (BRL) cease to use BCs in the 1980's?

To me the term BC shouts "Before Computers" more than "Ballistic Coefficient". Certianly the use of ballistic coefficients were a valuable tool before about 1980 when computers became available which were powerful enough that routine calcuations using complete drag functions were practical. Today a $300 notebook PC has orders of magnitude higher perormance and storage space than anything available to military ballisticians in the 1970's.

To allow a computer program based on drag functions to get started for bullets where that data doesn't exist the initiall database could be synthesized from existing BC data using whatever BC model is the better match for the bullet shape until measured or calculated drag functions become available. Calcuations done that way would be no worse than the exisiting programs which use G1 or G7 BCs and new entries as the data becomes available would be be better without the builit in errors.

The old MgDrag program does a decent job of generating a drag vs velocity function, but then most of the results get trashed when a single value G1 or G7 BC is derived from those caluations. The same is true when single value G1 or G7 BCs are derived from multiple screen chonograph or miillimeter wave radar test firings.

Last edited by LouBoyd; 08-21-2009 at 09:44 AM.
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Old 08-21-2009, 12:51 PM
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Re: Quest for g7 ballistics programs (can we please make a list)

So Lou, how would any bullet maker define their bullet, if not with BC?

Sounds like your suggesting that someday we should download drag curves for each bullet instead of accepting a single relative BC. But that data will never be available.
So adjustments to drag curve will still require a single reference in one form or the other.

Might as well be BC
G1 BC
G7 BC
Or LouBoyd BC, if your's is right
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Old 08-21-2009, 01:52 PM
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Re: Quest for g7 ballistics programs (can we please make a list)

Quote:
Originally Posted by bsl135 View Post
Great Idea Mike.

I'll add the one's I know of. As others post new ones below, I'll update this list so that they're all compiled in one place.

JBM (free; online)
RSI ($99.95; PC)
LoadBase ($148.50; PC and Mobile)
Point Mass Ballistics ($39.95; PC) this is the one that comes with my book
Al Bal (free; PC) Download-able from JBM site
BulletFlight (~$12; iPhone app)

I've been talking to Gerald Perry about adding G7 capability to Exbal. I don't know if he'll do it, he was talking about another program that he's working on that will have G7 though. I'm sure the more pressure he gets from customers the more likely he would be to consider adding G7 to Exbal.

-Bryan
Bryan:

LoadBase doesn't give you the ability to directly use the G7 drag form. It does allow you via velocity/distance tests to input data that will try and match the G1 form more closely with the G7 form. It comes as close as anything out there but it does it by massaging the G1 form. It does however, convert whatever you have for G1 data into G7 but it's still a massaged G1 form albeit verrry close.

In the end, when you look at the drag form used when ending up with your final Shoot data, you are using the massaged G1 form
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  #7  
Old 08-21-2009, 02:14 PM
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Re: Quest for g7 ballistics programs (can we please make a list)

ss7mm is correct.

If Bryan makes a mobile version it will likely be the first to use G7, I wouldn't count on GP to do either. He's got some catching up (or to do list items as he put it) with Exbal.
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Last edited by jmason; 08-21-2009 at 02:17 PM.
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