24hourcampfire.com
24hourcampfire.com
Previous Thread
Next Thread
Print Thread
Hop To
Joined: Jan 2008
Posts: 4,283
T
TLB2 Offline OP
Campfire Tracker
OP Offline
Campfire Tracker
T
Joined: Jan 2008
Posts: 4,283
A friend brought me his 100 and said it wouldnt cycle. Test fired it and had to drive spent round out with a cleaning rod. I scrubbed the chamber real well. The extractor is nearly ripping the rim off.

Im looking for some way to polish this out. Here is a pic of the brass
[Linked Image]

BP-B2

Joined: Oct 2007
Posts: 948
M
Campfire Regular
Offline
Campfire Regular
M
Joined: Oct 2007
Posts: 948
TLB2: pic is not too clear of fired brass. Take the guts off the barreled receiver, use a penlight to examine the chamber. Take more pictures of the fired case - if the chamber is rough - the fired case should show an "orange peel" pattern. You can try to polish the chamber walls with 400 sandpaper but don't touch the shoulder or chamber neck. Take it to a reliable gunsmith if you are not comfortable doing the above. M100 chambers are like M742 Remington chambers - no one cleans them and they get pitted and the extractor tries to do it's job and pulls the rim off the fired case which has expanded into the rough chamber upon firing.. Remington makes a chamber brush to scrub the chamber and it should work on the M100. Is the owner shooting FRESH factory loads or hot reloads or old ammo that was subject to high temperature in a hot car? That could be the problem. If not - you have a parts gun!Good luck with it, Mel

Joined: Jan 2008
Posts: 4,283
T
TLB2 Offline OP
Campfire Tracker
OP Offline
Campfire Tracker
T
Joined: Jan 2008
Posts: 4,283
The shiny spot at the end of the neck is where it seems to be sticking. You should be able to see a shiny ring on the brass

Im shooting new factory hornady 150


I cleaned the chamber with a .45 cal brush wrapped with lubed steel wool spun slowly with a drill

Last edited by TLB2; 10/16/16.
Joined: Jan 2001
Posts: 59,055
R
Campfire Kahuna
Offline
Campfire Kahuna
R
Joined: Jan 2001
Posts: 59,055
Originally Posted by TLB2
I cleaned the chamber with a .45 cal brush wrapped with lubed steel wool spun slowly with a drill
That won't do it..

Do what melchung advised above.. Only way to polish those chambers properly is to completely disassemble the rifle so as to be able to get at that chamber - and the use of 400 grit paper is what I use also..


Ex- USN (SS) '66-'69
Pro-Constitution.
LET'S GO BRANDON!!!
Joined: Nov 2003
Posts: 28,770
Campfire Ranger
Offline
Campfire Ranger
Joined: Nov 2003
Posts: 28,770
Originally Posted by Redneck
Originally Posted by TLB2
I cleaned the chamber with a .45 cal brush wrapped with lubed steel wool spun slowly with a drill
That won't do it..

Do what melchung advised above.. Only way to polish those chambers properly is to completely disassemble the rifle so as to be able to get at that chamber - and the use of 400 grit paper is what I use also..


WOW! I used 1200 grit and was a little concerned about being too aggressive. Maybe I spent unnecessary money on a new barrel. crazy


"Only Christ is the fullness of God's revelation."
Everyday Hunter
IC B2

Joined: Jan 2001
Posts: 59,055
R
Campfire Kahuna
Offline
Campfire Kahuna
R
Joined: Jan 2001
Posts: 59,055
I've used 1200 before - in fact, I've used 2000 a couple times.. But that was when I was polishing a shotgun barrel in prep for hot bluing.. The customer wanted a shine he could see his face in.. laugh

But on a chamber, 500 is about as fine as I'll ever go. 400 will polish any S/A chamber in order to give proper function..


Ex- USN (SS) '66-'69
Pro-Constitution.
LET'S GO BRANDON!!!
Joined: Jun 2004
Posts: 886
H
Campfire Regular
Offline
Campfire Regular
H
Joined: Jun 2004
Posts: 886
320 is considered industry standard. 400 is extra fine and considered by many as so fine it's hard for the brass to grip and will cause excessive bolt thrust. I call BS. The excess bolt thrust thing is a myth. The brass is only a bladder like an inner tube. Having the chamber super smooth hurts nothing. Polish it like chrome if you want. It hurts nothing. I think 400 is perfect. Keep in mind that with 400 the brass will leave marks in the chamber. It will look all kinds of scratched up even with pristine brass. After a few hundred rounds the marks will start to blend together and not look so bad.

Under normal pressure brass springs back .001" so it should never get really stuck. Excessive pressure will stretch things out beyond what the brass will spring back and that when they get really stuck. Ripping the rim off stuck. This is why I really dislike cutting the shank section out of a barrel for the purpose of saving weight. A high pressure round needs that bulk over the chamber to contain the pressure. Another factor in sticky bolt opening can be if the lower ramp has been cut on to aid feeding long rounds. That will allow that lug abutment to flex and that will allow the brass to expand lengthwise causing a sticky bolt opening.


"Hired Gun" Quickest and fastest all motor sand car on the planet.
3.008 at 104.8 300' of sand.

NRA Patron Life Member, Gunsmith, Instructor, Chief RSO
Joined: May 2005
Posts: 16,554
Campfire Ranger
Offline
Campfire Ranger
Joined: May 2005
Posts: 16,554
I used some finer than 600 and then I thought about it. In hand fitting parts 400 grit is the last step before true polishing. Removes almost no metal without really trying and gunk contaminating a chamber is considerably softer. Actually broken down 320 silicon carbide works best for me for cleaning up a chamber. When the bench is clean 400 does it.

For semiautos like the 100 extraction force is not great. Consider the area of the case that can contact the chamber, it doesn't take much gunk - carbon, surface rust, whatever - to cause problems.

Like HiredGun said in properly prepared ammo the brass springs back enough that polishing finer than 400 doesn't really add anything.


The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh

Which explains a lot.
Joined: Jan 2008
Posts: 4,283
T
TLB2 Offline OP
Campfire Tracker
OP Offline
Campfire Tracker
T
Joined: Jan 2008
Posts: 4,283
Thanks for the advice, Ill tear it down and polish with 400

Joined: Jan 2005
Posts: 53,303
Campfire Kahuna
Offline
Campfire Kahuna
Joined: Jan 2005
Posts: 53,303
Originally Posted by HiredGun
320 is considered industry standard. 400 is extra fine and considered by many as so fine it's hard for the brass to grip and will cause excessive bolt thrust. I call BS. The excess bolt thrust thing is a myth. The brass is only a bladder like an inner tube. Having the chamber super smooth hurts nothing. Polish it like chrome if you want. It hurts nothing. I think 400 is perfect. Keep in mind that with 400 the brass will leave marks in the chamber. It will look all kinds of scratched up even with pristine brass. After a few hundred rounds the marks will start to blend together and not look so bad.

Under normal pressure brass springs back .001" so it should never get really stuck. Excessive pressure will stretch things out beyond what the brass will spring back and that when they get really stuck. Ripping the rim off stuck. This is why I really dislike cutting the shank section out of a barrel for the purpose of saving weight. A high pressure round needs that bulk over the chamber to contain the pressure. Another factor in sticky bolt opening can be if the lower ramp has been cut on to aid feeding long rounds. That will allow that lug abutment to flex and that will allow the brass to expand lengthwise causing a sticky bolt opening.


Quote
The excess bolt thrust thing is a myth. The brass is only a bladder like an inner tube. Having the chamber super smooth hurts nothing.


You and I are on the same page of music,....

I've almost always started with 320,...and than gone progressively finer, as the spirit moved me.
If one doesn't understand the term uniform crosshatch, and surface speeds as it directly relates to the process of lapping, the wise thing to do is bring your recalcitrant chamber to someone who does.

I've got 3M Emory paper all the way out to 2000 grit,...there ARE times and places places where that comes in handy.

GTC



Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain





IC B3

Joined: Jan 2005
Posts: 53,303
Campfire Kahuna
Offline
Campfire Kahuna
Joined: Jan 2005
Posts: 53,303
Originally Posted by nighthawk
I used some finer than 600 and then I thought about it. In hand fitting parts 400 grit is the last step before true polishing. Removes almost no metal without really trying and gunk contaminating a chamber is considerably softer. Actually broken down 320 silicon carbide works best for me for cleaning up a chamber. When the bench is clean 400 does it.

For semiautos like the 100 extraction force is not great. Consider the area of the case that can contact the chamber, it doesn't take much gunk - carbon, surface rust, whatever - to cause problems.

Like HiredGun said in properly prepared ammo the brass springs back enough that polishing finer than 400 doesn't really add anything.


another 10X

GTC


Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain





Joined: Jan 2001
Posts: 59,055
R
Campfire Kahuna
Offline
Campfire Kahuna
R
Joined: Jan 2001
Posts: 59,055
Originally Posted by HiredGun
320 is considered industry standard. 400 is extra fine and considered by many as so fine it's hard for the brass to grip and will cause excessive bolt thrust. I call BS. The excess bolt thrust thing is a myth. The brass is only a bladder like an inner tube. Having the chamber super smooth hurts nothing. Polish it like chrome if you want. It hurts nothing. I think 400 is perfect. Keep in mind that with 400 the brass will leave marks in the chamber. It will look all kinds of scratched up even with pristine brass. After a few hundred rounds the marks will start to blend together and not look so bad.

Under normal pressure brass springs back .001" so it should never get really stuck. Excessive pressure will stretch things out beyond what the brass will spring back and that when they get really stuck. Ripping the rim off stuck. This is why I really dislike cutting the shank section out of a barrel for the purpose of saving weight. A high pressure round needs that bulk over the chamber to contain the pressure. Another factor in sticky bolt opening can be if the lower ramp has been cut on to aid feeding long rounds. That will allow that lug abutment to flex and that will allow the brass to expand lengthwise causing a sticky bolt opening.
All wonderfully stated...

Excellent..


Ex- USN (SS) '66-'69
Pro-Constitution.
LET'S GO BRANDON!!!
Joined: Jan 2008
Posts: 4,283
T
TLB2 Offline OP
Campfire Tracker
OP Offline
Campfire Tracker
T
Joined: Jan 2008
Posts: 4,283
Hopefully I got it polished enough. It took several times polishing with 400 grit in the neck area.

5 out of 6 fired brass will extract with my fingers. I will try to shoot it this weekend.

Thanks for the tips!

Joined: Jan 2008
Posts: 4,283
T
TLB2 Offline OP
Campfire Tracker
OP Offline
Campfire Tracker
T
Joined: Jan 2008
Posts: 4,283
Well it didnt work still scarring the brass right at the end of the neck. I wish I had a bore scope so I could see in the chamber.

Will a chamber reamer turned by hand clean the chamber up enough to get it to extract?


Moderated by  RickBin 

Link Copied to Clipboard
YB23

Who's Online Now
149 members (257_X_50, 338Rules, 444Matt, 32_20fan, 358WCF, 1minute, 18 invisible), 1,960 guests, and 946 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums81
Topics1,187,726
Posts18,400,650
Members73,822
Most Online11,491
Jul 7th, 2023


 







Fish & Game Departments | Solunar Tables | Mission Statement | Privacy Policy | Contact Us | DMCA
Hunting | Fishing | Camping | Backpacking | Reloading | Campfire Forums | Gear Shop
Copyright © 2000-2024 24hourcampfire.com, Inc. All Rights Reserved.
Powered by UBB.threads™ PHP Forum Software 7.7.5
(Release build 20201027)
Responsive Width:

PHP: 7.3.33 Page Time: 0.081s Queries: 14 (0.003s) Memory: 0.8588 MB (Peak: 0.9718 MB) Data Comp: Zlib Server Time: 2024-03-29 06:44:23 UTC
Valid HTML 5 and Valid CSS