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
Reloading
Relative Burn Rate Charts. . .
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="MagnumManiac" data-source="post: 1453775" data-attributes="member: 10755"><p>One major problem with burn rate charts.....is that burn rates are NOT constant from cartridge to cartridge AND, some powders BEHAVE differently in certain case shapes/bore sizes/expansion ratios.</p><p>In fact, in certain cartridges/cases a powder that is one step faster produces higher velocities with less powder than the slower powder does.</p><p>Typical examples are RE19 and RE22, in a few cartridges and bullet weights, they switch where RE19 behaves slower than RE22. Prime examples are in 30-06 and 338WM. Many believe this is due to 'performance' of the powder, but in fact it is the BEHAVIOUR of the powder in this expansion ratio.</p><p>These are not the only powders that do this.</p><p></p><p>I would take burn rate charts as a very BROAD UNSCIENTIFIC GUIDE ONLY.</p><p>No 2 manufacturers have a 'standard' that all other powders are matched to. IMR rate 4895 with a RQ (Relative Quickness) number of 100, all other powders are compared to this, faster get a lower number, slower get a higher number.</p><p>Hodgdon uses a different powder as a baseline, as do Winchester etc, etc.</p><p>So trying to answer which is the most accurate....your guess is as good as mine.</p><p>I look at the top 3 powders giving the highest velocities, these are generally the most EFFICIENT in that case size.</p><p>This a very good rule of thumb to go by when choosing a powder.</p><p>Hope this helps.</p><p></p><p>Cheers.</p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1453775, member: 10755"] One major problem with burn rate charts.....is that burn rates are NOT constant from cartridge to cartridge AND, some powders BEHAVE differently in certain case shapes/bore sizes/expansion ratios. In fact, in certain cartridges/cases a powder that is one step faster produces higher velocities with less powder than the slower powder does. Typical examples are RE19 and RE22, in a few cartridges and bullet weights, they switch where RE19 behaves slower than RE22. Prime examples are in 30-06 and 338WM. Many believe this is due to ‘performance’ of the powder, but in fact it is the BEHAVIOUR of the powder in this expansion ratio. These are not the only powders that do this. I would take burn rate charts as a very BROAD UNSCIENTIFIC GUIDE ONLY. No 2 manufacturers have a ‘standard’ that all other powders are matched to. IMR rate 4895 with a RQ (Relative Quickness) number of 100, all other powders are compared to this, faster get a lower number, slower get a higher number. Hodgdon uses a different powder as a baseline, as do Winchester etc, etc. So trying to answer which is the most accurate....your guess is as good as mine. I look at the top 3 powders giving the highest velocities, these are generally the most EFFICIENT in that case size. This a very good rule of thumb to go by when choosing a powder. Hope this helps. Cheers. :) [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Relative Burn Rate Charts. . .
Top