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
Interpreting Pressure Signs from Velocity (260 Remington load dev)
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="bigedp51" data-source="post: 1397962" data-attributes="member: 28965"><p>Measuring base expansion is only a indication of how much pressure that brand of brass can take.</p><p>The harder the brass and the thicker the flash hole web is controls base expansion.</p><p>There is nothing wrong with using base expansion because it lets you know if you are pushing the cases beyond there elastic limits. "But" as stated above you need to be able to measure in .0001 of an inch.</p><p></p><p>At Accurate shooter reloading forum many shooters increase the load until they get brass flow into the ejector and then back off 1 or 2 grains of powder.</p><p></p><p>Below this photo was posted at Accurate Shooter using the above method and then backing of the load.</p><p></p><p><img src="https://i.imgur.com/KtO65uH.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below you can see how much difference in brass hardness can effect base expansion. Along with the flash hole web thickness that adds radial strength to the base of the case. </p><p></p><p><span style="font-size: 12px"><strong>How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests</strong></span></p><p><span style="font-size: 12px"><strong><a href="http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/" target="_blank">http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/</a></strong></span></p><p><span style="font-size: 12px"><strong><img src="http://accurateshooter.net/Blog/brasstest03.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></strong></span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px"><strong>Below the photo shows how the thickness of the flash hole web can effect base expansion. And also why some brands of brass have stretched out primer pockets much sooner than other cases.</strong></span></p><p><span style="font-size: 12px"><strong> <img src="https://i.imgur.com/cYeTsDp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></strong></span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1397962, member: 28965"] Measuring base expansion is only a indication of how much pressure that brand of brass can take. The harder the brass and the thicker the flash hole web is controls base expansion. There is nothing wrong with using base expansion because it lets you know if you are pushing the cases beyond there elastic limits. "But" as stated above you need to be able to measure in .0001 of an inch. At Accurate shooter reloading forum many shooters increase the load until they get brass flow into the ejector and then back off 1 or 2 grains of powder. Below this photo was posted at Accurate Shooter using the above method and then backing of the load. [IMG]https://i.imgur.com/KtO65uH.jpg[/IMG] Below you can see how much difference in brass hardness can effect base expansion. Along with the flash hole web thickness that adds radial strength to the base of the case. [SIZE=3][B]How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests[/B] [B][URL]http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/[/URL][/B] [B][img]http://accurateshooter.net/Blog/brasstest03.png[/img][/B] [B][/B] [B]Below the photo shows how the thickness of the flash hole web can effect base expansion. And also why some brands of brass have stretched out primer pockets much sooner than other cases.[/B] [B] [img]https://i.imgur.com/cYeTsDp.jpg[/img][/B][/SIZE] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Interpreting Pressure Signs from Velocity (260 Remington load dev)
Top