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
AR15/10 Rifles
Reloading for Gas Guns?
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="Bart B" data-source="post: 800916" data-attributes="member: 5302"><p>The case will expand as if it was all by itself and not in a chamber. The thinnest side of the case body will expand the most; just like a balloon being inflated as it lays on a table top. I've cut off case heads about half an inch above the extractor groove and measured thickness. The thin side could be anyplace relative to how the case was indexed in the chamber. I used the firing pin tip's imprint details to tell what side of the case was pushed sideways against the chamber wall by the extractor when it fired.</p><p></p><p>Best way for me to measure case head squareness is to first decap it, then stand it on a flat surface against a V block of some sort. Spin the case and watch the case mouth. If the case mouth spins about its center, the head's square. If it moves around in a circle, the size of the circle indicates how much out of square the case head is. Do the same thing with live ammo and watch the bullet tip. Standing the case/round under a fixed magnifying glass makes it easier to see the top make a circle when the case head's out of square.</p><p></p><p>Congratulations on being one of the few that knows the back end of a case gets pushed off center in chambers by and in the direction extractors' force. Do you know where the shoulder of the case is when it fires? Most folks think the case rests in the bottom of the chamber.</p><p></p><p>I's available and cheap.</p></blockquote><p></p>
[QUOTE="Bart B, post: 800916, member: 5302"] The case will expand as if it was all by itself and not in a chamber. The thinnest side of the case body will expand the most; just like a balloon being inflated as it lays on a table top. I've cut off case heads about half an inch above the extractor groove and measured thickness. The thin side could be anyplace relative to how the case was indexed in the chamber. I used the firing pin tip's imprint details to tell what side of the case was pushed sideways against the chamber wall by the extractor when it fired. Best way for me to measure case head squareness is to first decap it, then stand it on a flat surface against a V block of some sort. Spin the case and watch the case mouth. If the case mouth spins about its center, the head's square. If it moves around in a circle, the size of the circle indicates how much out of square the case head is. Do the same thing with live ammo and watch the bullet tip. Standing the case/round under a fixed magnifying glass makes it easier to see the top make a circle when the case head's out of square. Congratulations on being one of the few that knows the back end of a case gets pushed off center in chambers by and in the direction extractors' force. Do you know where the shoulder of the case is when it fires? Most folks think the case rests in the bottom of the chamber. I's available and cheap. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Reloading for Gas Guns?
Top