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Ballistic Coeff. question.
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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stovepipe
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PostPosted: Mon Sep 21, 2009 11:03 am    Post subject: Ballistic Coeff. question. Reply with quote

I'll admitit. I aint that bright and.... I do not know the BC of my 200gr and 240gr Nos JHP.

If anyone and supply me with that info, or how to find out that info, I'd appreciate it and be a little more enlightened as I wanna play with some recipe numbers and bullet drop with a couple of recipe's.

Thanks,

-kevin.
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Pumpkinslinger
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PostPosted: Mon Sep 21, 2009 11:13 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

Assuming you're talking about the 0.429" diameter bullets, my Nosler manual Number Three says:

200 grain JHP BC = .151

240 grain JHP BC = .173

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stovepipe
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PostPosted: Mon Sep 21, 2009 11:16 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

Mikee to the rescue again!

I knew you'd have it.

Thank, bud.

-k.
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DallanC
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PostPosted: Mon Sep 21, 2009 11:44 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

If you know the muzzle velocity, and the 100 yard velocity, its not hard to compute the BC. Most people accept the "book" values but sometimes its useful to check those at times.


-DallanC
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stovepipe
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PostPosted: Mon Sep 21, 2009 11:47 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

Thanks D, I really don't know too much on how to calculate that stuff is my main problem.

The Point Blank thing we have here is really neat and something new or me. What a cool deal that is!
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SwampFox
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PostPosted: Mon Sep 21, 2009 1:33 pm    Post subject: Re: Ballistic Coeff. question. Reply with quote

One thing to watch when you take a BC from a Mfg's data is to check that data against another mfg. The marketing boys tend to play games with the BC numbers for their company. They know people check performance against computer programs and the base of the performance at distance is the BC.
Best,
Ed

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stovepipe
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PostPosted: Mon Sep 21, 2009 1:41 pm    Post subject: Re: Ballistic Coeff. question. Reply with quote

Thanks Ed, good to know.

Pop's has a lot of manuals and I'm going to go over there and do some resraching and stuff, see what he has on the subject. ... been too busy of late to get over there and I really should be learning more about this now that Boomer's done.

Good info guys, keep it coming.
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chambered221
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PostPosted: Mon Sep 21, 2009 5:11 pm    Post subject: Re: Ballistic Coeff. question. Reply with quote

Not that it pertains to handguns but longrange shooters often quote multiple B.C. figures at, below or above a given velocity.
For example: the Sierra 107gr. .243 bullet that is typically used in a 6BR from 600-1,000 yards will read something like this: BC: .527 @ 2500 fps and above; .522 between 2500 and 1800 fps

Also the only true way to measure B.C. is with 2 known velocities at 2 different distances with one bullet in flight going through a pair of chronographs.

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woods
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PostPosted: Mon Sep 21, 2009 6:20 pm    Post subject: Re: Ballistic Coeff. question. Reply with quote

www.shootforum.com/for...letdb.html

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stovepipe
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PostPosted: Tue Sep 22, 2009 6:15 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

Ah- I think I', starting to see the relationship between speed and BC.
Did not know that.

Like I said, stuff to learn.

Thanks gents.

Woods- do the "V" values pertain to a known speed? I'm not sure how to read that.
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chambered221
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PostPosted: Tue Sep 22, 2009 4:19 pm    Post subject: Re: Ballistic Coeff. question. Reply with quote

Select a caliber, After the bullet list comes up left click on “velocity 4” in the blue shaded area you’ll have different velocities pop up under “velocity" 1, 2, 3, and maybe 4
You can then read the B.C. for a given velocity spread by looking at “B.C. above” V1, V2, V3, and V4

Note: not all manufactures give all this data!!!

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stovepipe
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PostPosted: Wed Sep 23, 2009 6:47 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

I clicked the V1 etc...nothing came up. Might be this comp. I'll try my roomates laptop when I get home.
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chambered221
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PostPosted: Wed Sep 23, 2009 7:03 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

Click the far right box in the light blue that's labeled "velocity 4"

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chambered221
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PostPosted: Wed Sep 23, 2009 7:10 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

Actually clicking any of the "velocity" boxes you can get different data if it's available!!!

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Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!

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stovepipe
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PostPosted: Wed Sep 23, 2009 9:32 am    Post subject: Re: Ballistic Coeff. question. Reply with quote

Thank you sir.
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