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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Mon Sep 21, 2009 11:03 am Post subject: Ballistic Coeff. question. |
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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 Super Member
Joined: Sep 22, 2007 Posts: 5001 Location: NC foothills
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Posted: Mon Sep 21, 2009 11:13 am Post subject: Re: Ballistic Coeff. question. |
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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
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Mon Sep 21, 2009 11:16 am Post subject: Re: Ballistic Coeff. question. |
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Mikee to the rescue again!
I knew you'd have it.
Thank, bud.
-k.
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DallanC Site Admin
Joined: Jan 18, 2005 Posts: 3571 Location: Utah
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Posted: Mon Sep 21, 2009 11:44 am Post subject: Re: Ballistic Coeff. question. |
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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 Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Mon Sep 21, 2009 11:47 am Post subject: Re: Ballistic Coeff. question. |
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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 Super Member
Joined: Jul 15, 2005 Posts: 1040 Location: Destin, Florida
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Posted: Mon Sep 21, 2009 1:33 pm Post subject: Re: Ballistic Coeff. question. |
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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
_________________ The inherent vice of capitalism is the unequal sharing of the blessings. The inherent blessing of socialism is the equal sharing of misery.
-Winston Churchill |
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Mon Sep 21, 2009 1:41 pm Post subject: Re: Ballistic Coeff. question. |
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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 Super Member
Joined: Aug 17, 2007 Posts: 3455 Location: Lost for good !!!
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Posted: Mon Sep 21, 2009 5:11 pm Post subject: Re: Ballistic Coeff. question. |
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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.
_________________ Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!
A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.
~George Washington |
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woods Member
Joined: Oct 15, 2005 Posts: 89
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Posted: Mon Sep 21, 2009 6:20 pm Post subject: Re: Ballistic Coeff. question. |
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_________________ Guns only have 2 enemies, rust and politicians |
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Tue Sep 22, 2009 6:15 am Post subject: Re: Ballistic Coeff. question. |
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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 Super Member
Joined: Aug 17, 2007 Posts: 3455 Location: Lost for good !!!
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Posted: Tue Sep 22, 2009 4:19 pm Post subject: Re: Ballistic Coeff. question. |
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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!!!
_________________ Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!
A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.
~George Washington |
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Wed Sep 23, 2009 6:47 am Post subject: Re: Ballistic Coeff. question. |
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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 Super Member
Joined: Aug 17, 2007 Posts: 3455 Location: Lost for good !!!
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Posted: Wed Sep 23, 2009 7:03 am Post subject: Re: Ballistic Coeff. question. |
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Click the far right box in the light blue that's labeled "velocity 4"
_________________ Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!
A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.
~George Washington |
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chambered221 Super Member
Joined: Aug 17, 2007 Posts: 3455 Location: Lost for good !!!
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Posted: Wed Sep 23, 2009 7:10 am Post subject: Re: Ballistic Coeff. question. |
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Actually clicking any of the "velocity" boxes you can get different data if it's available!!!
_________________ Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!
A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.
~George Washington |
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Wed Sep 23, 2009 9:32 am Post subject: Re: Ballistic Coeff. question. |
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Thank you sir.
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