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 Rifles, Bullets, Barrels & Ballistics

# Ogive question.

#8
04-05-2005, 02:25 PM
 Platinum Member Join Date: Jun 2007 Posts: 1,519
Re: Ogive question.

From what I am putting together the ogive based on caliber would look something like this.

We start with a 30 cal diameter. I then made 3 circles that were 6 8 and 10 times as big. If we use the section cut on a plane horizontal to the center of the caliber we end up with half of a bullet tip profile. I'm assuming this is a tangent ogive???

If this is right then how come in the graphic above we see .5 for the ogive that is semicircle instead of 1. Are we dealing with the caliber radius or the diameter?
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GRAVITY. It's not just a good idea. It's the LAW!
#9
04-05-2005, 03:50 PM
 Silver Member Join Date: Aug 2003 Posts: 126
Re: Ogive question.

The number of calibers dictates the RADIUS of the circle describing the ogive. Thus a 10 caliber ogive for a .338 bullet would be described using a circle of RADIUS 3.380".
#10
04-05-2005, 04:32 PM
 Writers Guild Join Date: Jul 2001 Posts: 1,459
Re: Ogive question.

So does this mean that any calibre can be made to the same ogive thus BC? If this is true, then if we can figure out how to make them, you could have a 22cal bullet with a BC of 0.8 or whatever. That would have a ogive of 15 cals or so. Wouldn't be much more then 120gr so pretty easy to launch.

No recoil with ballistics on par with the super big 338's. Very interesting...

Jerry
#11
04-05-2005, 04:36 PM
Re: Ogive question.

You would need one hell of a case to launch a 120gr .22 cal to get the velocity to reach the 0.8 BC. I think that there is a limit to BCs in every caliber in useable bullet weight range. But, truely, I don't know much about BCs and what not.
#12
04-05-2005, 04:38 PM
 Platinum Member Join Date: Jun 2007 Posts: 1,519
Re: Ogive question.

[ QUOTE ]
The number of calibers dictates the RADIUS of the circle describing the ogive. Thus a 10 caliber ogive for a .338 bullet would be described using a circle of RADIUS 3.380".

[/ QUOTE ]

So the numbers in my illustration should have been 3 4 and 5?
__________________
GRAVITY. It's not just a good idea. It's the LAW!
#13
04-05-2005, 04:43 PM
 Platinum Member Join Date: Jun 2007 Posts: 1,519
Re: Ogive question.

[ QUOTE ]
So does this mean that any calibre can be made to the same ogive thus BC? If this is true, then if we can figure out how to make them, you could have a 22cal bullet with a BC of 0.8 or whatever

[/ QUOTE ]

Among many other things BC is also a function of weight. I cant imagine a 42 gr .22 bullet approaching the BC of a normally shaped 168 grain .30 cal no matter how long the ogive is.
__________________
GRAVITY. It's not just a good idea. It's the LAW!
#14
04-05-2005, 06:57 PM
 Platinum Member Join Date: Dec 2001 Location: Mukilteo, WA Posts: 1,092
Re: Ogive question.

[ QUOTE ]
So does this mean that any calibre can be made to the same ogive thus BC? If this is true, then if we can figure out how to make them, you could have a 22cal bullet with a BC of 0.8 or whatever.

[/ QUOTE ]
Remember, of equal importance as the aerodynamic shape to the BC, is the bullet's sectional density.

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