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
Help me determine what is causing my runout!
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: 304030" data-attributes="member: 1521"><p>I don't agree with generalizing TIR-vs-R(cutting TIR in half) because your runout cause would first have to be determind before going there. For example, if your runout is caused by big variance in thickness, this will be indicated regardless of centerline conditions. And in this case, your runout would be exactly as indicated(provided that is your only contributer).</p><p>Also it would be pretty rare that a positive variance will be followed by an exactly opposite negative variance with brass, because that would mean only one specific contributer, with no others combining in the abstract. That's not reality in my experience.</p><p></p><p>I also do not follow the collet die as a runout reducer idea. I just don't see how it would. What I see, is that it would contribute less towards additional runout. And as you have seen for yourself, it did not reduce runout.</p><p></p><p>You did not mention which Sinclair runout gauge you're using. I hope it's a standard V-block/bearing type. If not all bets are off.</p><p>If it is, then I would be very concerned about that initial runout measured right out of the chamber(before sizing). There should be essentially zero TIR on the necks at this time. If not, you've got an ugly chamber flaw(unlikely), or very high thickness variance in your brass, -producing bananas.</p><p>Don't assume any particular brand of brass is better in this regard. It varies from lot to lot in all of them.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 304030, member: 1521"] I don't agree with generalizing TIR-vs-R(cutting TIR in half) because your runout cause would first have to be determind before going there. For example, if your runout is caused by big variance in thickness, this will be indicated regardless of centerline conditions. And in this case, your runout would be exactly as indicated(provided that is your only contributer). Also it would be pretty rare that a positive variance will be followed by an exactly opposite negative variance with brass, because that would mean only one specific contributer, with no others combining in the abstract. That's not reality in my experience. I also do not follow the collet die as a runout reducer idea. I just don't see how it would. What I see, is that it would contribute less towards additional runout. And as you have seen for yourself, it did not reduce runout. You did not mention which Sinclair runout gauge you're using. I hope it's a standard V-block/bearing type. If not all bets are off. If it is, then I would be very concerned about that initial runout measured right out of the chamber(before sizing). There should be essentially zero TIR on the necks at this time. If not, you've got an ugly chamber flaw(unlikely), or very high thickness variance in your brass, -producing bananas. Don't assume any particular brand of brass is better in this regard. It varies from lot to lot in all of them. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Help me determine what is causing my runout!
Top