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
Runout issues with Redding Comp Bushing die
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="boomtube" data-source="post: 414759" data-attributes="member: 9215"><p>Two things. </p><p> </p><p>No matter how straight the outside of a neck is, what counts is how well the inside matches the outside. That's why many of us skim turn the outside of our necks, it provides for more cosistant thickness and better alignment.</p><p> </p><p>Bushing dies aren't the magic cure-all for concentricity some seem to think they are. Lee's collet neck sizers are perhaps the best neck dies for factory chambers.</p><p> </p><p> </p><p>Expanders can easily pull a straight neck out of alignment and the greater the difference between the sized inner diameter and the expander diameter is, the more probalble some neck bending will occur. That's why it's best to obtain a bushing that's as close to the expanded outside diameter you want as possible. It's great if your expander just barely rubs the necks on the way out.</p><p> </p><p>It appears that some folks "measure" neck runout improperly and have much more of it than they realize. And some don't seem to understand that the Total Indicated Runout (TIR) is twice the acutal runout so their's seems worse than it actually is. Seating a bullet just magnifies whatever runout problems the necks already have.</p><p> </p><p>It's not impossible to get basically "zero" runout on individual rounds but it's very hard to get zero on an entire run. That requires perfect cases, perfect dies and perfect work methods. And a lot of good but not perfect cases get culled. (Nothing has absolute zero runout if we measure to enough decimal places, but anything under 1 thou TIR is an effective zero.)</p></blockquote><p></p>
[QUOTE="boomtube, post: 414759, member: 9215"] Two things. No matter how straight the outside of a neck is, what counts is how well the inside matches the outside. That's why many of us skim turn the outside of our necks, it provides for more cosistant thickness and better alignment. Bushing dies aren't the magic cure-all for concentricity some seem to think they are. Lee's collet neck sizers are perhaps the best neck dies for factory chambers. Expanders can easily pull a straight neck out of alignment and the greater the difference between the sized inner diameter and the expander diameter is, the more probalble some neck bending will occur. That's why it's best to obtain a bushing that's as close to the expanded outside diameter you want as possible. It's great if your expander just barely rubs the necks on the way out. It appears that some folks "measure" neck runout improperly and have much more of it than they realize. And some don't seem to understand that the Total Indicated Runout (TIR) is twice the acutal runout so their's seems worse than it actually is. Seating a bullet just magnifies whatever runout problems the necks already have. It's not impossible to get basically "zero" runout on individual rounds but it's very hard to get zero on an entire run. That requires perfect cases, perfect dies and perfect work methods. And a lot of good but not perfect cases get culled. (Nothing has absolute zero runout if we measure to enough decimal places, but anything under 1 thou TIR is an effective zero.) [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Runout issues with Redding Comp Bushing die
Top