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
Sizing die bushing
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: 2029104" data-attributes="member: 1521"><p>You likely need a .309 bushing.</p><p>If you'll be sizing down more than 5thou, you should try a .310 bushing to mitigate excess sizing.</p><p></p><p>What happens is the bushing takes the neck down to .309,, on release the neck springs back outward to maybe .310 OD. That's not 'tension', but ~1thou of 'interference' fit. Tension is a matter of spring back force gripping an area of seated bullet bearing. We currently have no way to measure this, but we can adjust tension through annealing and sizing length.</p><p>Adequate interference is the amount that necks spring back from sizing. This is usually ~1/2thou, but 1thou is easy & doesn't hurt. Sizing down more really does nothing functional, as the seated bullet will just expand the neck right back up to counter that extra effort. So it's just excess sizing, and excess seating force.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2029104, member: 1521"] You likely need a .309 bushing. If you'll be sizing down more than 5thou, you should try a .310 bushing to mitigate excess sizing. What happens is the bushing takes the neck down to .309,, on release the neck springs back outward to maybe .310 OD. That's not 'tension', but ~1thou of 'interference' fit. Tension is a matter of spring back force gripping an area of seated bullet bearing. We currently have no way to measure this, but we can adjust tension through annealing and sizing length. Adequate interference is the amount that necks spring back from sizing. This is usually ~1/2thou, but 1thou is easy & doesn't hurt. Sizing down more really does nothing functional, as the seated bullet will just expand the neck right back up to counter that extra effort. So it's just excess sizing, and excess seating force. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Sizing die bushing
Top