The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Reply
 
Thread Tools Search this Thread
Old November 26, 2013, 07:52 PM   #1
std7mag
Senior Member
 
Join Date: June 23, 2013
Location: Central Pennsyltucky...
Posts: 945
questions on throat errosion, again... lol

Ok, so lets say someone has a rifle chambered in 6mm Remington BR.
After "x" amount of rounds, said person notices that it is not as accurate as it once was, and discovers throat erosion.

My question is, to what length does the throat typically erode?
aka could this person rechamber the barrel to say a .243 Win AI?

And once that erodes, could you go to say a 6mm-284?

Each rechambering being slightly longer than the previous.

Or am I waaay over simplifying this???
std7mag is offline  
Old November 27, 2013, 09:53 AM   #2
Rimfire5
Senior Member
 
Join Date: January 2, 2009
Location: Northern Virginia
Posts: 615
I have a Savage 10 FCP-K that I measured the chamber for when it was unfired and after 800 rounds.
The chamber to ogive measurements for Sierra 168 SMKs increased by 0.013 inches.
A buddy with a slightly older (1500 rounds) 10 FCP-K had a chamber increase of 0.030.

I put over 6000 rounds through my original Savage 10 FP before it started to lose accuracy and I sent it back to the factory for a new barrel. The chamber length increased over 0.1 inches by the time I decided it was ready for a new barrel.

I just got it back from Savage with a new upgraded threaded and fluted target barrel with the action bright and shiny and the stock looking brand new. They did a great job in cleaning it up.
The total bill was $429 including shipping back to me. If I didn't upgrade the barrel and have it fluted, the total price would have been about $333. It took about a month from the time I sent it to the time it returned.

It goes to the range for its first range session on Friday morning.
Rimfire5 is offline  
Old November 27, 2013, 03:00 PM   #3
FrankenMauser
Senior Member
 
Join Date: August 25, 2008
Location: 1B ID
Posts: 10,194
Unless you want to make all of your existing dies and brass obsolete, there's no reason to rechamber the barrel to another cartridge.

There are two cheaper options for fixing a eroded throat:
1. "Throat" it. - Cut the throat deeper, to clean it up. Of course, some people will feel the need to load bullets to OALs that put them right on the lands; while others are fine with a little more bullet jump. It's your call.
2. Set the barrel back. - Pull it, take a small slice off the chamber end, recut the chamber, and reinstall it.


Every throat erodes differently. The most extreme case I've seen was a .223 WSSM that had over 0.300" 'sand blasted' into oblivion by a shooter that would fire continuously, until the rifle was too hot to handle. He bought it new and only took the rifle to the range 3 times, before he had completely cooked it.
__________________
"Such is the strange way that man works -- first he virtually destroys a species and then does everything in his power to restore it."
FrankenMauser is offline  
Old November 27, 2013, 06:12 PM   #4
tobnpr
Senior Member
 
Join Date: August 1, 2010
Location: Tampa Bay
Posts: 4,371
Sounds to me like you're way overcomplicating it, not oversimplifying.

Like FM said. Why change chamberings? Keep what ya got.
__________________
Remington 700/Savage Rebarreling /Action Blueprinting
07 FFL /Mosin-Nagant Custom Shop/Bent Bolts
Genuine Cerakote Applicator
www.biggorillagunworks.com
tobnpr is offline  
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump


All times are GMT -5. The time now is 03:21 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2017 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.04734 seconds with 10 queries