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
Chatting and General Stuff
General Discussion
What's Wrong With .30 Caliber? By Bryan Litz
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="britz" data-source="post: 259817" data-attributes="member: 7865"><p>Wow, that was a technical based article. Now I will admit to being a little intimidated by the knowledge base that the author obviously had, but I'm going to challenge some of what he said. </p><p></p><p>If I understood correctly he said that a moderate 7mm will push a heavy weight bullet as fast as a Very large mag 30 cal will push a heavyweight bullet. And he said that the BC of the heavy 7mm and the heavy 30 are "vertually" the same.</p><p></p><p>He also conceded that the 190 class 30 is comparable to the 168 class 284. I looked at the WSM's and the 7 pushing a 168 is going around 50 or so fps slower than the 300 will push a 190 according to Hodgdon's data (rough numbers of course but the point is that the 30 will push it slightly faster). I beleive this makes sense because of the PSI and the surface area that the respective bullets have. larger surface area and same weight = higher veleocity. Simply put, taking a 30 cal and a 284 cal in terms of Pounds per square inch the 7mm will require to be multiplied by 1.18 to equal the square inches of the .308. </p><p></p><p>It is true that the 190 is heavier than the 168 also, but you only have to multiply the 168 by 1.13 to equal the 190. SO... if my rough math is right then the 30 cal will always have a slight advantage over the 7mm due to the fact that the increase in surface area being pushed increased faster than the weight of the bullet (in this class).</p><p></p><p> ALSO, if you consider that the 190 has a higer BC than the 168 (@.53 to 49 respectively). </p><p></p><p>HOWEVER, and a big "however" that is... Recoil is a major issue and I will definately concede that the smaller 6.5 and even the 7mm's give up small amounts of BC to reduce large amounts of recoil.</p><p></p><p>VERY Cool article and a good brain teezer (hopefully I was somewhat close in my figures otherwise I'll have to stick my tail between my legs and run home lol!)</p></blockquote><p></p>
[QUOTE="britz, post: 259817, member: 7865"] Wow, that was a technical based article. Now I will admit to being a little intimidated by the knowledge base that the author obviously had, but I'm going to challenge some of what he said. If I understood correctly he said that a moderate 7mm will push a heavy weight bullet as fast as a Very large mag 30 cal will push a heavyweight bullet. And he said that the BC of the heavy 7mm and the heavy 30 are "vertually" the same. He also conceded that the 190 class 30 is comparable to the 168 class 284. I looked at the WSM's and the 7 pushing a 168 is going around 50 or so fps slower than the 300 will push a 190 according to Hodgdon's data (rough numbers of course but the point is that the 30 will push it slightly faster). I beleive this makes sense because of the PSI and the surface area that the respective bullets have. larger surface area and same weight = higher veleocity. Simply put, taking a 30 cal and a 284 cal in terms of Pounds per square inch the 7mm will require to be multiplied by 1.18 to equal the square inches of the .308. It is true that the 190 is heavier than the 168 also, but you only have to multiply the 168 by 1.13 to equal the 190. SO... if my rough math is right then the 30 cal will always have a slight advantage over the 7mm due to the fact that the increase in surface area being pushed increased faster than the weight of the bullet (in this class). ALSO, if you consider that the 190 has a higer BC than the 168 (@.53 to 49 respectively). HOWEVER, and a big "however" that is... Recoil is a major issue and I will definately concede that the smaller 6.5 and even the 7mm's give up small amounts of BC to reduce large amounts of recoil. VERY Cool article and a good brain teezer (hopefully I was somewhat close in my figures otherwise I'll have to stick my tail between my legs and run home lol!) [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Chatting and General Stuff
General Discussion
What's Wrong With .30 Caliber? By Bryan Litz
Top