Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
What is ogive?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Mikecr" data-source="post: 1699262" data-attributes="member: 1521"><p>This is likely due to difference in ogive radius between a 26cal & 25cal bullet. If their ogive radius was the same then cal diameter would not cause the error to change as you describe. And if secant ogives, the error is way larger than tangent.</p><p></p><p>On another note, ogive radius also cannot be measured with one datum. It takes at least two different points on the same nose to determine ogive radius. And with hybrids these points must be each on the different forms (one on tangent section, the other on secant section, neither on transition).</p><p></p><p>Ogive radius variance is a real factor with mass manufactured bullets. It can significantly change where your tool takes datum. It takes a bit of thought to understand it, but in reality this does not affect land relationship with seated bullets like you might think it would. It's self compensating in that regard.</p><p>However, when trying to match bullets, it's a problem.</p><p>With this, don't even attempt to match bullets until qualifying ogives from two points of measure. This is what the Bob Green Tool(BGC) does at once, but some folks measure two points separately. I've also done it separately with a blade mic/indicator rig, and washed numbers through software to get actual ogive radius per nose instead of merely comparing noses. An educational endeavor that IMO is not viable to hunting or even competition.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1699262, member: 1521"] This is likely due to difference in ogive radius between a 26cal & 25cal bullet. If their ogive radius was the same then cal diameter would not cause the error to change as you describe. And if secant ogives, the error is way larger than tangent. On another note, ogive radius also cannot be measured with one datum. It takes at least two different points on the same nose to determine ogive radius. And with hybrids these points must be each on the different forms (one on tangent section, the other on secant section, neither on transition). Ogive radius variance is a real factor with mass manufactured bullets. It can significantly change where your tool takes datum. It takes a bit of thought to understand it, but in reality this does not affect land relationship with seated bullets like you might think it would. It's self compensating in that regard. However, when trying to match bullets, it's a problem. With this, don't even attempt to match bullets until qualifying ogives from two points of measure. This is what the Bob Green Tool(BGC) does at once, but some folks measure two points separately. I've also done it separately with a blade mic/indicator rig, and washed numbers through software to get actual ogive radius per nose instead of merely comparing noses. An educational endeavor that IMO is not viable to hunting or even competition. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
What is ogive?
Top