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
Tell me if im wrong.
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="Mikecr" data-source="post: 1307493" data-attributes="member: 1521"><p>A plunger is a type of ejector, as a standing blade is a type of ejector.</p><p>'Pressure problems' are often more about the problems(and their real cause) than actual pressure.</p><p>He could have a rough plunger, foreign material, and/or bolt lugs out of true. Flattening primers can be caused by excess head spacing. Difficult extraction could be caused by a bad sizing situation, and loosening primer pockets by excess chamber clearances and/or not enough barrel steel around the chamber, or poor breech support. Bad extraction/bolt click can also result from poor action timing. A lot of things manifesting with pressure, described as pressure problems, while not actually caused by pressure.</p><p></p><p>With any new chamber I run a test on once fired brass to determine 'MyMax' pressure per velocity calibrated Quickload. This is incremental load increases while measuring the webline with a blade mic. I'll see growth, then a ~level plateau, and then runaway. That point is continuing yielding and FL sizing is required for yielding. From what I've seen, there is no a reason to go beyond the point of needing FL sizing. Even if the gun can handle it just fine, it isn't viable for your brass. Where this actually falls w/resp to SAAMI max doesn't matter a bit. Could be a little above or below. Common notions of pressure 'problems' during this testing, again, separate problems to solve -not pressure.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1307493, member: 1521"] A plunger is a type of ejector, as a standing blade is a type of ejector. 'Pressure problems' are often more about the problems(and their real cause) than actual pressure. He could have a rough plunger, foreign material, and/or bolt lugs out of true. Flattening primers can be caused by excess head spacing. Difficult extraction could be caused by a bad sizing situation, and loosening primer pockets by excess chamber clearances and/or not enough barrel steel around the chamber, or poor breech support. Bad extraction/bolt click can also result from poor action timing. A lot of things manifesting with pressure, described as pressure problems, while not actually caused by pressure. With any new chamber I run a test on once fired brass to determine 'MyMax' pressure per velocity calibrated Quickload. This is incremental load increases while measuring the webline with a blade mic. I'll see growth, then a ~level plateau, and then runaway. That point is continuing yielding and FL sizing is required for yielding. From what I've seen, there is no a reason to go beyond the point of needing FL sizing. Even if the gun can handle it just fine, it isn't viable for your brass. Where this actually falls w/resp to SAAMI max doesn't matter a bit. Could be a little above or below. Common notions of pressure 'problems' during this testing, again, separate problems to solve -not pressure. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Tell me if im wrong.
Top