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
Rifles, Bullets, Barrels & Ballistics
25-06 velocity?
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="cdherman" data-source="post: 881090" data-attributes="member: 12282"><p>Here's another curve ball.</p><p> </p><p>For a monolithic bullet, the bullet geometry is scaleable. A bullet that is identical in .243 should behave the same as a .500. Someone correct me if I am wrong...</p><p> </p><p>But in a jacketed bullet, as the caliber decreases, the proportion of the bullet dedicated to the soft and light jacket INCREASES. So the ballistic coefficient suffers.</p><p> </p><p>Propose a mental exercise: The jacket for a .308 might be around .035. That means that a .035" layer of soft light copper is surrounding a relatively large heavy lead core. .308 minus .07 is .238 lead core diameter. </p><p> </p><p>Now, do the same for .223. The jacket for a hunting bullet must remain relatively thick, so perhaps the same .035. .223 minus .070 is 0.153" Note the greater proportional fall in lead core diameter.</p><p> </p><p>Now, perform the same calculation for my hypothetical .070 caliber cartridge. 0.70" minus 0.70 jacket thickness = 0 The bullet has no lead....</p><p> </p><p>Of course this is an exaggeration, but the concept is that as caliber falls, the jacket thickness does not fall proportionally. That means small caliber bullets increasingly behave like monolithic bullets. Generally, the monoliths are great for hunting, but long range work is a problem since their SD are limited.</p></blockquote><p></p>
[QUOTE="cdherman, post: 881090, member: 12282"] Here's another curve ball. For a monolithic bullet, the bullet geometry is scaleable. A bullet that is identical in .243 should behave the same as a .500. Someone correct me if I am wrong... But in a jacketed bullet, as the caliber decreases, the proportion of the bullet dedicated to the soft and light jacket INCREASES. So the ballistic coefficient suffers. Propose a mental exercise: The jacket for a .308 might be around .035. That means that a .035" layer of soft light copper is surrounding a relatively large heavy lead core. .308 minus .07 is .238 lead core diameter. Now, do the same for .223. The jacket for a hunting bullet must remain relatively thick, so perhaps the same .035. .223 minus .070 is 0.153" Note the greater proportional fall in lead core diameter. Now, perform the same calculation for my hypothetical .070 caliber cartridge. 0.70" minus 0.70 jacket thickness = 0 The bullet has no lead.... Of course this is an exaggeration, but the concept is that as caliber falls, the jacket thickness does not fall proportionally. That means small caliber bullets increasingly behave like monolithic bullets. Generally, the monoliths are great for hunting, but long range work is a problem since their SD are limited. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
25-06 velocity?
Top