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
300 RUM Barrel Length
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="River Man" data-source="post: 165401" data-attributes="member: 9084"><p>One thing I noticed during my testing was that some powders produced a higher velocity with the longer barrel than did others. </p><p> </p><p>Per Hodgdon, a 24 inch barreled 300 RUM with 190 gr SMK loaded with 104gr of US869 should achieve 3035 fps. I got 3240 fps out of a 35 inch barrel which is a 205 fps increase.</p><p> </p><p>Also per Hodgdon, a 24 inch barreled 300 RUM with 190 gr SMK loaded with 96 grains of Retumbo should achieve 3204 fps. I got 3200 out of a 35 inch barrel which is a loss of 4 fps.</p><p> </p><p>Clearly, 35 inches is not too long for US869 but is ineffective for Retumbo. This demonstrates what people have said earlier that the powder burn rate will affect maximum effective length of barrel. </p><p> </p><p>The Retumbo is a faster burning powder than US869. But not by a whole lot. Retumbo is #99 on Hodgdons burn rate list. US869 is #104 on the list. I suspect that the 35 inch barrel is approaching the maximum effective limit for US869 in a 300 RUM.</p></blockquote><p></p>
[QUOTE="River Man, post: 165401, member: 9084"] One thing I noticed during my testing was that some powders produced a higher velocity with the longer barrel than did others. Per Hodgdon, a 24 inch barreled 300 RUM with 190 gr SMK loaded with 104gr of US869 should achieve 3035 fps. I got 3240 fps out of a 35 inch barrel which is a 205 fps increase. Also per Hodgdon, a 24 inch barreled 300 RUM with 190 gr SMK loaded with 96 grains of Retumbo should achieve 3204 fps. I got 3200 out of a 35 inch barrel which is a loss of 4 fps. Clearly, 35 inches is not too long for US869 but is ineffective for Retumbo. This demonstrates what people have said earlier that the powder burn rate will affect maximum effective length of barrel. The Retumbo is a faster burning powder than US869. But not by a whole lot. Retumbo is #99 on Hodgdons burn rate list. US869 is #104 on the list. I suspect that the 35 inch barrel is approaching the maximum effective limit for US869 in a 300 RUM. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM Barrel Length
Top