Calguns.net  

Home My iTrader Join the NRA Donate to CGSSA Sponsors CGN Google Search
CA Semiauto Ban(AW)ID Flowchart CA Handgun Ban ID Flowchart CA Shotgun Ban ID Flowchart
Go Back   Calguns.net > INTERESTS AND ACTIVITIES > Gunsmithing & How To
Register FAQ Members List Calendar Mark Forums Read

Gunsmithing & How To Pro, Amateur & WECSOG and Tutorials, Guides & OLL Build Instructions

Reply
 
Thread Tools Display Modes
  #1  
Old 05-13-2018, 1:04 PM
nn21 nn21 is offline
Junior Member
 
Join Date: Nov 2015
Location: Sacramento
Posts: 68
iTrader: 0 / 0%
Default R700 Barrel Work Sacramento

Anyone have any recommendations for someone to set the shoulder back on an r700 barrel around Roseville? Hand reamed at touch too far and I'd like to set the shoulder of the barrel back a few thousandths.
Reply With Quote
  #2  
Old 05-13-2018, 3:44 PM
ar15barrels's Avatar
ar15barrels ar15barrels is offline
I need a LIFE!!
 
Join Date: Jan 2006
Location: Van Nuys
Posts: 43,832
iTrader: 94 / 100%
Default

If it's only a few thousandths, you could also take it off the recoil lug instead of the barrel.
Anyone with a surface grinder could do that in a few minutes.
__________________
Randall Rausch

AR work: www.ar15barrels.com
Bolt actions: www.700barrels.com
Foreign Semi Autos: www.akbarrels.com
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
Founding member of the CAPRC
Reply With Quote
  #3  
Old 05-13-2018, 6:47 PM
kendog4570's Avatar
kendog4570 kendog4570 is offline
Veteran Member
 
Join Date: Dec 2008
Location: Oakhurst, CA
Posts: 3,926
iTrader: 22 / 100%
Default

Why did you run a reamer in the chamber, and what exactly is "a few thousandths"?
Reply With Quote
  #4  
Old 05-13-2018, 8:28 PM
nn21 nn21 is offline
Junior Member
 
Join Date: Nov 2015
Location: Sacramento
Posts: 68
iTrader: 0 / 0%
Default

Quote:
Originally Posted by ar15barrels View Post
If it's only a few thousandths, you could also take it off the recoil lug instead of the barrel.
Anyone with a surface grinder could do that in a few minutes.
That's a great idea and certainly makes finding someone way easier....Thanks Randall

Last edited by nn21; 05-13-2018 at 9:32 PM..
Reply With Quote
  #5  
Old 05-13-2018, 10:07 PM
kendog4570's Avatar
kendog4570 kendog4570 is offline
Veteran Member
 
Join Date: Dec 2008
Location: Oakhurst, CA
Posts: 3,926
iTrader: 22 / 100%
Default

If the chamber is too long, the barrel needs to come off,measurements made and calculated and headspace adjusted by either method, and put back together. Also the possibility of having to recut the counterbore for correct clearance. At the end of the day it's basically the same work.
Reply With Quote
  #6  
Old 05-13-2018, 10:08 PM
ar15barrels's Avatar
ar15barrels ar15barrels is offline
I need a LIFE!!
 
Join Date: Jan 2006
Location: Van Nuys
Posts: 43,832
iTrader: 94 / 100%
Default

Quote:
Originally Posted by kendog4570 View Post
and what exactly is "a few thousandths"?
A few should be 3-5.
More than a couple (1-2) and less than half a dozen.
__________________
Randall Rausch

AR work: www.ar15barrels.com
Bolt actions: www.700barrels.com
Foreign Semi Autos: www.akbarrels.com
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
Founding member of the CAPRC
Reply With Quote
  #7  
Old 05-13-2018, 10:19 PM
kendog4570's Avatar
kendog4570 kendog4570 is offline
Veteran Member
 
Join Date: Dec 2008
Location: Oakhurst, CA
Posts: 3,926
iTrader: 22 / 100%
Default

All ya gotta do is...
There is likely more to the story
Reply With Quote
  #8  
Old 05-13-2018, 10:20 PM
ar15barrels's Avatar
ar15barrels ar15barrels is offline
I need a LIFE!!
 
Join Date: Jan 2006
Location: Van Nuys
Posts: 43,832
iTrader: 94 / 100%
Default

Quote:
Originally Posted by kendog4570 View Post
All ya gotta do is...
There is likely more to the story
Always is...
__________________
Randall Rausch

AR work: www.ar15barrels.com
Bolt actions: www.700barrels.com
Foreign Semi Autos: www.akbarrels.com
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
Founding member of the CAPRC
Reply With Quote
  #9  
Old 05-13-2018, 10:54 PM
nn21 nn21 is offline
Junior Member
 
Join Date: Nov 2015
Location: Sacramento
Posts: 68
iTrader: 0 / 0%
Default

I'll elaborate:

I was finish reaming a short chamber barrel and got a little overzealous towards the finish. In an effort to extend brass life, and reap whatever accuracy benefits I could from a tight chamber, I was aiming for go +.001 and ended up right between go +.002 and .003 with the action torqued to the barrel (I'm measuring using some mic'd brass shimstock added to the end of the go gauge. Will close on .002 wont close on .003). Not concerned from a safety standpoint, it won't close on a nogo gauge. I was just curious as to the feasibility of setting the shoulder back (or the recoil lug since Randall suggested) and getting closer to the nominal dimension to extend brass life. Of course, the question becomes: will a couple thou make a noticeable difference in brass life and accuracy?

Last edited by nn21; 05-13-2018 at 11:01 PM..
Reply With Quote
  #10  
Old 05-14-2018, 3:24 AM
kcstott's Avatar
kcstott kcstott is online now
Toolmaker Extraordinaire
CGN Contributor
 
Join Date: Nov 2011
Location: National City Socal
Posts: 10,338
iTrader: 18 / 100%
Default

Quote:
Originally Posted by nn21 View Post
I'll elaborate:

I was finish reaming a short chamber barrel and got a little overzealous towards the finish. In an effort to extend brass life, and reap whatever accuracy benefits I could from a tight chamber, I was aiming for go +.001 and ended up right between go +.002 and .003 with the action torqued to the barrel (I'm measuring using some mic'd brass shimstock added to the end of the go gauge. Will close on .002 wont close on .003). Not concerned from a safety standpoint, it won't close on a nogo gauge. I was just curious as to the feasibility of setting the shoulder back (or the recoil lug since Randall suggested) and getting closer to the nominal dimension to extend brass life. Of course, the question becomes: will a couple thou make a noticeable difference in brass life and accuracy?
Actually since it is that close you NEED to find some one with a surface grinder. that or you need to get a piece of 320 grit paper on a flat surface with some wd40 and start sanding.

Setting up in the lathe to take a .001" clean up cut is not going to happen. well not easily it won't, and it's far better to grind the lug than fight the barrel.

seriously though if you have something remotely flat that you can lay sand paper on this would take about five minutes. thing is you need to keep the pressure even and mic it often as you creep up on it, and I mean mic it, not calipers.
__________________
Quote:
Originally Posted by ar15barrels View Post
Dick.

Quote:
Originally Posted by tujungatoes View Post
That guy is a hack. He worked on one of my ak's and now the damn thing only shoots .50 cal bullets.
The above statement i consider a term of endearment
Need prints for your build? Need reference materials for Gunsmithing projects, Click Here
I fear that even though as tough as life has been for me I have only begun to pay for my sins.
Don't forget to have your Liberals spayed or neutered !
Reply With Quote
  #11  
Old 05-14-2018, 5:42 AM
kendog4570's Avatar
kendog4570 kendog4570 is offline
Veteran Member
 
Join Date: Dec 2008
Location: Oakhurst, CA
Posts: 3,926
iTrader: 22 / 100%
Default

I think you are worried about nothing. You could probably close it up that much with crush on the threads. It is within spec. Adjust your sizing die and go shoot.
Reply With Quote
  #12  
Old 05-14-2018, 6:16 AM
kcstott's Avatar
kcstott kcstott is online now
Toolmaker Extraordinaire
CGN Contributor
 
Join Date: Nov 2011
Location: National City Socal
Posts: 10,338
iTrader: 18 / 100%
Default

Quote:
Originally Posted by kendog4570 View Post
I think you are worried about nothing. You could probably close it up that much with crush on the threads. It is within spec. Adjust your sizing die and go shoot.
Yeah but he’ll always know it was .001” off of what he wanted.
But yes you are correct. One more 1/16” of rotation = .001” in crush
__________________
Quote:
Originally Posted by ar15barrels View Post
Dick.

Quote:
Originally Posted by tujungatoes View Post
That guy is a hack. He worked on one of my ak's and now the damn thing only shoots .50 cal bullets.
The above statement i consider a term of endearment
Need prints for your build? Need reference materials for Gunsmithing projects, Click Here
I fear that even though as tough as life has been for me I have only begun to pay for my sins.
Don't forget to have your Liberals spayed or neutered !
Reply With Quote
  #13  
Old 05-14-2018, 9:21 AM
ar15barrels's Avatar
ar15barrels ar15barrels is offline
I need a LIFE!!
 
Join Date: Jan 2006
Location: Van Nuys
Posts: 43,832
iTrader: 94 / 100%
Default

I chamber barrels to 0.001" off a go gauge and find the crush from tightening into the reciever is usually about 0.0005", leaving me a nice 0.0005" clearance on a go gauge once assembled.

Pre-fit barrels usually have around 0.015" of bolt nose clearance built into them.
That's why I said it's no problem to surface grind the lug a few thousandths (5 or less) to tighten headspace.
You would still have 0.010" of bolt nose clearance after taking 5 off the lug.
__________________
Randall Rausch

AR work: www.ar15barrels.com
Bolt actions: www.700barrels.com
Foreign Semi Autos: www.akbarrels.com
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
Founding member of the CAPRC
Reply With Quote
Reply

Thread Tools
Display Modes

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 -8. The time now is 2:49 AM.




Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Proudly hosted by GeoVario the Premier 2A host.
Calguns.net, the 'Calguns' name and all associated variants and logos are ® Trademark and © Copyright 2002-2018, Calguns.net an Incorporated Company All Rights Reserved.
Calguns.net and The Calguns Foundation have no affiliation and are in no way related to each other.
All opinions, statements and remarks made by Calguns.net on this web site and elsewhere are solely attributable to Calguns.net.