The Firing Line Forums

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

Reply
 
Thread Tools
Old January 20, 2012, 03:38 PM   #1
Oldtimer
Junior Member
 
Join Date: October 7, 2009
Location: Ruffsdale, PA
Posts: 7
Black sealant in military LC-69 case necks

I purchased 500 new LC-69 cases, over 15 years ago.
I went to reload some and found a black sealant in side the case necks.
I want to fl resize these before loading, and am afraid in doing so, will crud up my resizing die.
How can I remove this sealant ?
Oldtimer is offline  
Old January 20, 2012, 03:41 PM   #2
3kgt2nv
Senior Member
 
Join Date: January 7, 2012
Location: hudson valley NY
Posts: 465
try a 22cal copper bore brush or tumble them to remove it.
3kgt2nv is offline  
Old January 20, 2012, 04:00 PM   #3
Unclenick
Staff
 
Join Date: March 4, 2005
Location: Ohio
Posts: 10,195
That sealant is asphaltum, or pitch, so your cases were pull-downs from loaded ammo. Nothing wrong with that. The sealant dissolves completely and pretty quickly in odorless mineral spirits and probably any of a dozen other solvents. A Q-tip wet with mineral spirits will get it out with some rubbing, but it's easier just to stand the cases mouth-down in a covered dish with half an inch of mineral spirits in it and let them sit overnight. Pull them out and let them dry the next day.
__________________
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Patron Member
Unclenick is offline  
Old January 21, 2012, 02:15 AM   #4
medalguy
Senior Member
 
Join Date: August 31, 2009
Location: New Mexico
Posts: 1,017
Unclenick is right. There's maybe another way also. Several years ago I bought several thousand pulldown .30 M2 bullets with the sealer on them. I just put them in the tumbler and added a fair amount of mineral spirits to the cob, and tumbled them clean in 2-3 hours. I'm not sure if this would work with brass or not, but it might be worth a try. It's easier than having to brush every neck.
medalguy is offline  
Old January 21, 2012, 06:44 PM   #5
Unclenick
Staff
 
Join Date: March 4, 2005
Location: Ohio
Posts: 10,195
I think that should be OK. You don't want corncob to swell inside cases, or it will get stuck, but mineral spirits won't swell it as much as water does. Try just a small capful at a time, checking every hour. I know a lot of folks add that small amount to tumble just to wake the polish up a little.
__________________
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Patron Member
Unclenick is offline  
Old January 21, 2012, 09:46 PM   #6
hagar
Senior Member
 
Join Date: February 20, 2000
Location: Colombia, SC
Posts: 516
I think it more than a sealant, it also prevents the case bonding with the bullet, a problem I have run into with reloads I loaded a longgg time ago.
__________________
I don't have time for busy people
hagar is offline  
Old January 22, 2012, 04:38 AM   #7
sob (sweet ole bill)
Member
 
Join Date: October 13, 2008
Location: coastal North Carolina
Posts: 65
Back Sealant

Try brake cleaning fluid. Used it on pulled .308's worked fast and easy

SOB
sob (sweet ole bill) is offline  
Old January 23, 2012, 04:52 PM   #8
Unclenick
Staff
 
Join Date: March 4, 2005
Location: Ohio
Posts: 10,195
Hagar,

It doesn't usually cover the whole bullet. They just painted a stripe or two inside each neck to act sort of like O-rings. Bullets still get stuck hard if the ammo gets old enough. Normal pull weight is well under 100 lbs, but a former Aberdeen Proving Grounds employee said he'd measured up to 600 lbs pull in some old stock. Still fired properly, though.
__________________
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Patron Member
Unclenick is offline  
Old January 24, 2012, 12:25 PM   #9
FM12
Senior Member
 
Join Date: February 5, 2007
Location: Monroeville, Alabama
Posts: 1,598
If these have not been fired, I doubt they need sizing at all. YMMV.
FM12 is offline  
Old January 26, 2012, 07:43 AM   #10
GerryG
Member
 
Join Date: March 21, 2007
Location: Michigan
Posts: 17
At the minimum, neck sizing may be needed for proper bullet tension.
GerryG is offline  
Reply

Thread Tools

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 06:57 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2014 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.07424 seconds with 7 queries