Bullet ogive...

[20PPC]

Is there an easy way to determine what a bullets ogive is ?

 

[GerryM]

There is a chart in Hatcher,s note book

 

[6ShotsOr5?]

You mean easier than using a comparator? That’s not hard.

 

[Fast14riot]

Do you mean what radius and/or type (secant or tangent)?

 

[RegionRat]

Is there an easy way to determine what a bullets ogive is ?

If we assume you mean the type of profile in terms of radius and center...
The easiest way is if the manufacturer tells you.

The inspection equipment in labs isn't cheap, so estimating the type by roughly comparing to known samples is usually easier than trying to make measurements without inspection resources. The drawings in the Applied Ballistics books are not common, so if the bullet you are interested in happens to be one he has published you are in luck.

I used a Taylor Hobson profilometer to trace profiles, but the cost of that machine is not worth repeating in decent company. I also had a Zeiss UMC850 (CMM) and an operator who knew his craft, and he could back the geometry out as well. Those are not things you can fake in the average garage.

 

[20PPC]

Actually I have some bullets from a friend that he couldn't remember what ogive they were, they shot so well I thought I might order another set of dies to duplicate them.

 

[RegionRat]

As in you want to order bullet swage dies?

Does he remember where he got the dies? If you went to the same source you could probably send a sample back there with your order and they could match them up.

 

[Richard Coody]

Interesting tidbit of information

The ogive of a bullet is usually characterized by the length of its radius. This radius is often given in calibers instead of inches. For example, an 8 ogive 6mm bullet has an ogive that is a segment of a circular arc with a radius of 8*. 243 = 1.952”.

Then we get into tangent and secant (VLD) ogives

Bullet Design–Secant vs. Tangent Ogive « Daily Bulletin

Many shooters and hand-loaders lack a clear understanding of certain elements of bullet design. While most serious shooters know that Secant and Tangent Ogive bullets are different, many of us would have trouble explaining the precise nature of the difference. Thankfully, <a href=http://www.

bulletin.accurateshooter.com

 

[chop house]

Those are not things you can fake in the average garage.

 

[bozo699]

…

 

[mikecr]

Is there an easy way to determine what a bullets ogive is ?

No easy way.
It isn't just cals of nose length, but also shape to define.
Like for example, an 8cal tangent, or a 12cal secant, or a 10cal hybrid.

If you can fill in some blanks for me(in inches), I can calculate it. I need:
- Bearing begin(Nose begin) Diameter
- Nose Length
- Meplat Diameter
That gives me base tangent ogive form.
Now pick (2) datums and declare each, then:
- Measure from nose-bearing begin to 1st Datum
- Measure from 1st to 2nd Datum
From here I can match resultant RT/R, with a Secant forming or Hybrid adjustment.