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
ejector marks
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: 1306876" data-attributes="member: 28965"><p>Ejector marks, base expansion and reading primers are all "ball park" guesstimates of chamber pressure. Brass hardness, case construction in the base, primer cup thickness and hardness govern visual indications of chamber pressure.</p><p></p><p>I have had factory loaded Federal .223/5.56 cases with over sized primer pockets after the first firing. And this was caused by thin flash hole webs and soft brass.</p><p></p><p>Below CatShooter did some Rockwell testing of brass hardness. And I can tell you a load in Lake City 5.56 cases without any ejector marks will show on softer cases.</p><p></p><p><strong><span style="font-size: 10px">How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests</span></strong></p><p></p><p><u><u><u><u><u><a href="http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/" target="_blank">How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests « Daily Bulletin</a></u></u></u></u></u></p><p><u><u></u></u></p><p><u><u><img src="http://accurateshooter.net/Blog/brasstest03.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></u></u></p><p><u><u></u></u></p><p><u><u>Below is a chart from the Lucky Gunner</u></u></p><p><u><u><u><u><a href="http://www.luckygunner.com/labs/5-56-vs-223/" target="_blank">http://www.luckygunner.com/labs/5-56-vs-223/</a></u></u></u></u></p><p><u><u></u></u></p><p><u><u><img src="http://labscdn2.luckygunner.com/labs/media/2012/06/barnes-pressure.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></u></u></p><p><u><u></u></u></p><p><u><u></u></u>Above the left green bar is a factory loaded .223 just below 50,000 psi. And the .223 is rated at 55,000 psi and shows that the vast majority of factory ammunition is loaded "below" maximum rated chamber pressure.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1306876, member: 28965"] Ejector marks, base expansion and reading primers are all "ball park" guesstimates of chamber pressure. Brass hardness, case construction in the base, primer cup thickness and hardness govern visual indications of chamber pressure. I have had factory loaded Federal .223/5.56 cases with over sized primer pockets after the first firing. And this was caused by thin flash hole webs and soft brass. Below CatShooter did some Rockwell testing of brass hardness. And I can tell you a load in Lake City 5.56 cases without any ejector marks will show on softer cases. [B][SIZE=2]How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests[/SIZE][/B] [U][U][U][U][U][URL="http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/"]How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests « Daily Bulletin[/URL][/U][/U][/U] [IMG]http://accurateshooter.net/Blog/brasstest03.png[/IMG] Below is a chart from the Lucky Gunner [U][U][URL]http://www.luckygunner.com/labs/5-56-vs-223/[/URL][/U][/U] [IMG]http://labscdn2.luckygunner.com/labs/media/2012/06/barnes-pressure.png[/IMG] [/U][/U]Above the left green bar is a factory loaded .223 just below 50,000 psi. And the .223 is rated at 55,000 psi and shows that the vast majority of factory ammunition is loaded "below" maximum rated chamber pressure. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
ejector marks
Top