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
Barrel length and 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="J E Custom" data-source="post: 790730" data-attributes="member: 2736"><p>Dan Lilja did a test that involved starting with a 46" barrel and cutting the barrel 2 inches shorter</p><p>and re crowning after each test.</p><p></p><p>It is a very good article and well worth reading. Log on to his web site and find it in "Articles".</p><p></p><p>It shows the relationship with velocity and barrel length and the deference in short barrels and </p><p>long barrels also.</p><p></p><p>I don,t know if there is a good way to measure efficiency of any load except if it is consistently </p><p>faster or shows less pressure than listed loads. Also some barrels are a little faster than others</p><p>with the same loading and may skew any efficiency test.</p><p></p><p>For years I had heard that short fat cases were more efficient than longer cartridges with less body diameter. and when comparing a 7 WSM to a 7 rem mag I found that it took the same or less powder in the 7 rem mag to achieve the same velocity with the same bullet weight Even though </p><p>the effective barrel length in the 7 rem mag was shorter because the case is longer with the same overall barrel length.</p><p></p><p>The powder and primers were the same in both rifles.</p><p></p><p>As you said there are so many variables that I don,t think there is any way to accurately measure</p><p>efficiency.</p><p></p><p>Just my opinion.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 790730, member: 2736"] Dan Lilja did a test that involved starting with a 46" barrel and cutting the barrel 2 inches shorter and re crowning after each test. It is a very good article and well worth reading. Log on to his web site and find it in "Articles". It shows the relationship with velocity and barrel length and the deference in short barrels and long barrels also. I don,t know if there is a good way to measure efficiency of any load except if it is consistently faster or shows less pressure than listed loads. Also some barrels are a little faster than others with the same loading and may skew any efficiency test. For years I had heard that short fat cases were more efficient than longer cartridges with less body diameter. and when comparing a 7 WSM to a 7 rem mag I found that it took the same or less powder in the 7 rem mag to achieve the same velocity with the same bullet weight Even though the effective barrel length in the 7 rem mag was shorter because the case is longer with the same overall barrel length. The powder and primers were the same in both rifles. As you said there are so many variables that I don,t think there is any way to accurately measure efficiency. Just my opinion. J E CUSTOM [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel length and velocity?
Top