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
Neck Tension Effect on Accuracy
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: 1253181" data-attributes="member: 1521"><p>Since switching from FL neck sizing to partial neck sizing, you have an opportunity to learn about tension. Go ahead an bushing size a length of neck no greater than seated bullet bearing. Seat and measure the loaded neck diameter. Then pull the bullet and measure what the neck springs back to. That spring back, against seated bearing area, is your bullet grip (tension).</p><p>It will likely be around .0005 to .0008".</p><p>You could swap bushings to cause any interference fit greater than this, repeat the test, and there will be no change(spring back is what it is). So adjustment of tension means adjustment of either length of neck sizing, or a change of spring back itself (annealing or work hardening).</p><p>If you do this testing, you'll learn what most never do.</p><p></p><p>FL sizing of necks causes max tension, and max variance of it, with no real control over it. It brings donut area into tension, and also binds bullet base-bearing junction to cause far more/uncontrolled grip than simple force x area.</p><p>This is no good, and why partial length bushing sizing has potential for better results(if you know what you're doing). You only need to develop with a plan, that includes a given tension.</p><p></p><p>As far as runout,, different subject all together. But I've yet to have an issue with runout from use of bushings.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1253181, member: 1521"] Since switching from FL neck sizing to partial neck sizing, you have an opportunity to learn about tension. Go ahead an bushing size a length of neck no greater than seated bullet bearing. Seat and measure the loaded neck diameter. Then pull the bullet and measure what the neck springs back to. That spring back, against seated bearing area, is your bullet grip (tension). It will likely be around .0005 to .0008". You could swap bushings to cause any interference fit greater than this, repeat the test, and there will be no change(spring back is what it is). So adjustment of tension means adjustment of either length of neck sizing, or a change of spring back itself (annealing or work hardening). If you do this testing, you'll learn what most never do. FL sizing of necks causes max tension, and max variance of it, with no real control over it. It brings donut area into tension, and also binds bullet base-bearing junction to cause far more/uncontrolled grip than simple force x area. This is no good, and why partial length bushing sizing has potential for better results(if you know what you're doing). You only need to develop with a plan, that includes a given tension. As far as runout,, different subject all together. But I've yet to have an issue with runout from use of bushings. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension Effect on Accuracy
Top