One more newbie question - chamber neck clearance - Shooters Forum
» Advanced

Go Back   Shooters Forum > Rifle and Rifle Cartridges > Wildcat Cartridges
Register FAQ Members List Donate Calendar Search Today's Posts Mark Forums Read

LinkBack Thread Tools Rate Thread Display Modes
Old 04-14-2010, 01:07 PM
Beartooth Regular
Join Date: Mar 2010
Posts: 675
One more newbie question - chamber neck clearance

Registered Users do not see the above ad.

Once I decide this question, then I can order my reamer... I've (we actually) decided to go with a .358 WSSM.

So, for a hunting rifle, I'm obviously not going to use a tight chamber such as 0.002" of neck clearance...

But what is a good place to be? I've seen reamer prints everywhere from 0.002" to 0.006" and how much will it matter on a 300 yard gun?

I've already ordered "standard" dies from Redding, whose reamer drawing says 0.390". But it seems that turning the necks to ~0.012" to 0.014" would be required...

I'd rather not turn the case necks except to get rid of the "donut". I'm getting a consistent 0.016" to 0.017" after necking up the brass, except for the donut which is right at 0.020" to 0.021".

So after turning the donut back to 0.017" that all adds up to 0.392".

My though is to go with 0.395" or 0.396" for the neck diameter on the reamer. What are your thoughts?
Reply With Quote
Old 04-14-2010, 04:02 PM
Big Bore's Avatar
Beartooth Regular
Join Date: Jan 2001
Location: Southern Indiana
Posts: 1,951
The .399 that the HDH (WSSM) used requires not neck turning and is what Dave Manson recommended. And I doubt you will have that doughnut since you are necking up instead of down. The doughnut does not matter anyway except on cases prepped for extreme accuracy. The only case I remove the doughnuts on are my 1000 yard .50 BMG match cases.
On a fairly short range rifle you sure would be better off with a bit much than too little on the chamber clearance since on a hunting rifle it is not improbable that lint or some other crud could find its way into the chamber and could keep a round from fully seating.
Personally I'd go with what Dave recommends since he has been doing wildcat reamers for a whole lot longer than most of us combined. With a .017 neck that only leaves .006 inch clearance on a .399 chamber and that is not all that much, being only .003 per side. Much less than that and you could run into chambering problems if dirty or when the normal case neck increases in thickness due to repeated firings.
Join the N.R.A.
On the 8th day, God created HKs.
Beware speaking with a sharp tongue as you are apt to cut your own throat.
Join the N.R.A.
Reply With Quote
Old 04-20-2010, 11:27 AM
Beartooth Regular
Join Date: Mar 2010
Posts: 675
Well, it's a moot point now - neck turning is inevitable.

We got our dies (Redding 358/25 WSSM, P/N 80739), and I took some measurements (we happen to have a nice set of gauges here at work) and neck turning will be required for the dies to work properly.

Appropriate neck thickness for these dies is going to be 0.015" or less. Dave Manson has already made the change on my order, and I will be getting a 0.390" neck dimension in my chamber.

Last edited by kludge; 04-20-2010 at 01:12 PM.
Reply With Quote

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Neck Sizing Problems with Different Brass The Bolt Man Handloading Procedures/Practices 16 11-17-2013 11:28 AM
Need lube for neck sizing only? Jakeway Handloading Procedures/Practices 13 01-13-2010 05:58 AM
Newbie Question azret General Discussion 9 12-05-2008 01:54 PM
Neck sizing question Kermit Handloading Procedures/Practices 10 03-24-2008 05:30 AM
Computer/Forum question KenK General Discussion 8 12-15-2007 05:44 PM

All times are GMT -8. The time now is 02:34 AM.

< Contact Us - Shooters Forum - Archive - Privacy Statement >


All Content & Design Copyright © 1999-2002 Beartooth Bullets, All Rights Reserved
Privacy Statement | Contact Webmaster
Website Design & Development By Exbabylon Internet Solutions
Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1