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#344582 - 08/15/07 07:49 PM Where in the heck..
UPSman
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Can I find the Ballistic Coefficient of a 300WSM 180 gr Fusion Bullet? Figured I can get the answer faster here than Googling it

Edited by UPSman (08/15/07 09:07 PM)
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#345042 - 08/15/07 10:25 PM Re: Where in the heck.. [Re: UPSman]
Tiny
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Good Question.Might be listed on there web site or in the catalog.I think I have one of there catalogs around here somewhere.
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#345084 - 08/15/07 10:37 PM Re: Where in the heck.. [Re: Tiny]
Tiny
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Well it wasn't listed in there catalog don't know about the web site.
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#345156 - 08/15/07 11:00 PM Re: Where in the heck.. [Re: Tiny]
Tiny
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Well I didn't see no where on there web site but this might help.


http://www.fusionammo.com/FusionBallistics.html
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#346326 - 08/16/07 03:46 PM Re: Where in the heck.. [Re: Tiny]
UPSman
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Thanks Tiny, but I have that looked at that ballistics table. I was looking for the BC so that I could put it into this thing here . It may not make that big of a difference, I don't know.
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#347094 - 08/16/07 09:19 PM Re: Where in the heck.. [Re: UPSman]
Tiny
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Thought that was Why you was wanting to know the BC,and yes it does make a difference in the math,as does other items.How much is the debateable part.

Might have to call fusion and get it. I have called to get ammo company's listed or a bullets BC in the past to use in ballistic programs.


Edited by Tiny (08/16/07 11:42 PM)
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#347719 - 08/17/07 07:59 AM Re: Where in the heck.. [Re: Tiny]
.45 COLT
Spike


Registered: 03/26/03
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Loc: North Georgia

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If the Fusion Ballistics Table is correct, then the BC=.510

DC


Edited by .45 COLT (08/17/07 08:00 AM)

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#349300 - 08/17/07 04:51 PM Re: Where in the heck.. [Re: .45 COLT]
UPSman
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Looks like 45 COLT came thru for us Tiny. Thanks man, I appreciate it.
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#350126 - 08/18/07 12:57 AM Re: Where in the heck.. [Re: .45 COLT]
Tiny
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.45 Colt,

Good going on the math or program run through to get that BC. Seems a little high giving the bullets profile from looking at a few loaded rounds.

Either way I would like to know how you came up with it.
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#350172 - 08/18/07 07:20 AM Re: Where in the heck.. [Re: UPSman]
.45 COLT
Spike


Registered: 03/26/03
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Loc: North Georgia

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Looked pretty high to me too. That's why I put in the caveat about their Ballistic Table being correct.

To get the figure, I plugged their figures into an external ballistics program, tweaked the BC until their downrange figures tracked. Then re-checked on two other external ballistics programs.

I think they might be a little optimistic but that's not unusual for manufacturers. One major manufacturer pulled all their rimfire ballistics "information" from their website when they realized that what they were claiming for velocity/drop figures was impossible.

And a caveat of my own: Ballistic Coefficient of a bullet isn't a fixed figure. It can/will vary depending on velocity. Usually this won't make too much difference to most, so it is neglected. The figure given by a manufacturer for a bullet, or the figure calculated, is close enough for any practical work.

DC

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