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
Chatting and General Stuff
General Discussion
Factory Ammo Pierced Primer
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="CatShooter" data-source="post: 163265" data-attributes="member: 7"><p>Yes... there are two parts to it. The flattened primer (on the outside of the primer) and the punched out primer.</p><p></p><p>These two signs together are pretty much definitive.</p><p></p><p>If the primer was flat on the outside, and rounded on the pin indention, it is a sign of headspace (not necessarily TOO MUCH headspace).</p><p></p><p>If it had a crater that was like the top of a donut or bagel, it is oversized firing pin hole.</p><p></p><p>But there is one more thing. On the case that is NOT perforated, the firing pin dent in the left primer is shallow, and well defined. The typical pin dia is 0.055"... and the typical pin protrusion is (Ta, ta) 0.055"... so under normal conditions, the pin dent should be about as deep as it is wide. But in the left hand case, the pin hole looks to be about 1/2 as deep as it is wide... it has a dished shape. Buy itself, I would not say this is a definitive cause of anything... but taking in account all the other things, I would say this is further evidence of higher than acceptable pressure. And further, there is the slightest beginning of primer material starting to ooze (for lack of a more scientific word), as though with a little help, it too would perforate. </p><p></p><p>Reading primers is a black art at best... taking years of looking at the little devils, and correlating what you see, with what you know from other sources (pressure gauges, etc).</p><p></p><p>.</p></blockquote><p></p>
[QUOTE="CatShooter, post: 163265, member: 7"] Yes... there are two parts to it. The flattened primer (on the outside of the primer) and the punched out primer. These two signs together are pretty much definitive. If the primer was flat on the outside, and rounded on the pin indention, it is a sign of headspace (not necessarily TOO MUCH headspace). If it had a crater that was like the top of a donut or bagel, it is oversized firing pin hole. But there is one more thing. On the case that is NOT perforated, the firing pin dent in the left primer is shallow, and well defined. The typical pin dia is 0.055"... and the typical pin protrusion is (Ta, ta) 0.055"... so under normal conditions, the pin dent should be about as deep as it is wide. But in the left hand case, the pin hole looks to be about 1/2 as deep as it is wide... it has a dished shape. Buy itself, I would not say this is a definitive cause of anything... but taking in account all the other things, I would say this is further evidence of higher than acceptable pressure. And further, there is the slightest beginning of primer material starting to ooze (for lack of a more scientific word), as though with a little help, it too would perforate. Reading primers is a black art at best... taking years of looking at the little devils, and correlating what you see, with what you know from other sources (pressure gauges, etc). . [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Chatting and General Stuff
General Discussion
Factory Ammo Pierced Primer
Top