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Ogive question.

 
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  #1  
Old 04-04-2005, 10:56 PM
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Ogive question.

Wildcat bullets offers an 8, 10 and ULD ogive. Can someone tell me if these are standard designations like a thread pitch or a guage and where they come from and what .30 cal bullet has each of these ogives so I can look at an example of each of them on line?
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Old 04-04-2005, 11:24 PM
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Re: Ogive question.

It basically describes the radius of curvature of the "nose" part of the bullet relative to the caliber. The higher the number, the larger the radius--the "flatter" the sides of the nose will be and (all else being equal) the longer the nose will be. It gets more complicated than that when you talk about secant ogives and offsets, but that should give you a basic idea. Here's a visual:



Many Sierra MK's, Nosler BT/AB's are around a 6 caliber tangent ogive. A pretty good compromise between aerodynamics (high BC) and not being picky about the rifles throat, seating depth, etc to provide good accuracy.

Many Hornadies (A-Max, Interbond, SST, "Spire Point"), Swift Sciroccos, old XBT's, etc use a more aggressive (~8-10 Caliber) Secant ogive. This is better aerodynamically (higher BC) but can be pickier about which rifle they shoot the best in, seating depth, etc.

VLD, ULD, get even more aggressive in search of higher and higher BC's.

That's very generalized, but hopefully it gives you a decent idea what the terms mean.
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Old 04-04-2005, 11:43 PM
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Re: Ogive question.

Great graphic. Thanks.

That helps solidify my choice on which ogive I will be putting on my first order of Wildcats.
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Old 04-05-2005, 02:03 AM
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Re: Ogive question.

Were the Wildcats secant or tangent?
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Old 04-05-2005, 07:55 AM
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Re: Ogive question.

Thanks. I had the same question, just hadn't asked it yet.
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Old 04-05-2005, 08:14 AM
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Re: Ogive question.

Mikecr,

I believe both designs are used depending on bullet.

Alot of the ULD bullets have an ogive between 10 and 15.

Good Shooting!!

Kirby Allen(50)
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Old 04-05-2005, 01:57 PM
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Re: Ogive question.

[ QUOTE ]
Were the Wildcats secant or tangent?

[/ QUOTE ]

I don't know. when I spoke with Richard on the phone he just used the numbers 8 10 and ULD.

That would be a good next question for him, which one he uses.

Next question for you guys- What is the difference between a secant and tangent ogive technically speaking?

What effect do we see with one over the other practically speaking?
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