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
Sticky extraction
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: 1836729" data-attributes="member: 1521"><p>The LW small base die will work to get cases chambering freely. But this approach will not work around the extraction problem for long, and it won't stop pockets from opening.</p><p></p><p><em>Brass wants to go where it's been</em></p><p>Popping extraction brass that was not subject to over-pressure and resting 2thou larger means your chamber clearance there is ~2thou. This is larger than needed at webs, and nothing is free.</p><p>If this is not a magnum action then you also lack breach support for a magnum diameter cartridge.</p><p>On firing the case expands to chamber, while the chamber itself is expanding. If this is an excess distance the case will yield, and will not spring back enough to clear the chamber once pressure has dropped. Extraction, then difficult, eventually pops past this interference fit with the chamber.</p><p>You can squish the brass way back down -but it will forever want to go right back where it has been -until annealed to lose that memory.</p><p></p><p>The camp that still believes more clearances are better remind me of shade tree mechanics of the early 70s.</p><p>Their hot rod engines were not reliable, and their fix (higher clearances) was actually the cause from the git-go.</p><p>They were already too high...</p><p>Engines last so much longer today because clearances are way tighter and better controlled.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1836729, member: 1521"] The LW small base die will work to get cases chambering freely. But this approach will not work around the extraction problem for long, and it won't stop pockets from opening. [I]Brass wants to go where it's been[/I] Popping extraction brass that was not subject to over-pressure and resting 2thou larger means your chamber clearance there is ~2thou. This is larger than needed at webs, and nothing is free. If this is not a magnum action then you also lack breach support for a magnum diameter cartridge. On firing the case expands to chamber, while the chamber itself is expanding. If this is an excess distance the case will yield, and will not spring back enough to clear the chamber once pressure has dropped. Extraction, then difficult, eventually pops past this interference fit with the chamber. You can squish the brass way back down -but it will forever want to go right back where it has been -until annealed to lose that memory. The camp that still believes more clearances are better remind me of shade tree mechanics of the early 70s. Their hot rod engines were not reliable, and their fix (higher clearances) was actually the cause from the git-go. They were already too high... Engines last so much longer today because clearances are way tighter and better controlled. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Sticky extraction
Top