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
Hunting
Long Range Hunting & Shooting
How far with 180 grains and a 300 rum?
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="MontanaRifleman" data-source="post: 390623" data-attributes="member: 11717"><p>Generally speaking, when we decrease pressure we also decrease velocity. But different bullet/powder combinations will have different pressure/velocity ratios. </p><p> </p><p>If we look at Hodgdons load data for the 300 RUM and 200 gr AB, we see that 92.5 gr of H1000 produces 62800 psi and 2975 fps while 95.5 gr of slower burning Retumbo produces 62,400 psi and 3050 fps - lower pressure and greater velocity. If we go to the 200 gr Barnes XFB and Retumbo, we see 62,800 psi and 2988 fps - more pressure, less velocity than the 200 gr AB and Retumbo.</p><p> </p><p>The GS bullets are moly coated and banded and designed in such a way as to produce minimum friction while the bands seal the escaping gasses behind them. They can be easily tapped down a bore with a cleaning rod.</p><p> </p><p>Reducing friction can increase velocity with same or lower pressures. </p><p> </p><p>Changing burn rates can accomplish the same thing which is why we see different velocities with max loads of differnt powders in the same bullets.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 390623, member: 11717"] Generally speaking, when we decrease pressure we also decrease velocity. But different bullet/powder combinations will have different pressure/velocity ratios. If we look at Hodgdons load data for the 300 RUM and 200 gr AB, we see that 92.5 gr of H1000 produces 62800 psi and 2975 fps while 95.5 gr of slower burning Retumbo produces 62,400 psi and 3050 fps - lower pressure and greater velocity. If we go to the 200 gr Barnes XFB and Retumbo, we see 62,800 psi and 2988 fps - more pressure, less velocity than the 200 gr AB and Retumbo. The GS bullets are moly coated and banded and designed in such a way as to produce minimum friction while the bands seal the escaping gasses behind them. They can be easily tapped down a bore with a cleaning rod. Reducing friction can increase velocity with same or lower pressures. Changing burn rates can accomplish the same thing which is why we see different velocities with max loads of differnt powders in the same bullets. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
How far with 180 grains and a 300 rum?
Top