The Firing Line Forums

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

Reply
 
Thread Tools
Old May 17, 2012, 02:31 PM   #1
marklyftogt
Senior Member
 
Join Date: March 11, 2012
Location: Salinas, CA
Posts: 137
Two crimps on factory 38spl cases?

I have been loading 38 spl 148 gr HBWC for a while and have noticed that some previously fired cases (all i have are Federal) have a second crimp about where the bottom of the bullet would be.

Thinking about loading 158 gr LRN.

I am guessing the second crimp would be pretty hard for us "roll your owners" without some expensive dies.

What is the purpose for this crimp and how do reloaders compensate for that or do we need to?
marklyftogt is offline  
Old May 17, 2012, 02:37 PM   #2
mrawesome22
Senior Member
 
Join Date: November 9, 2005
Location: Ohio, Appalachia's foothills.
Posts: 3,779
It is there so the bullet doesn't push farther into the case.

Sent from MIUI using Tapatalk 2.
mrawesome22 is offline  
Old May 17, 2012, 04:24 PM   #3
wncchester
Senior Member
 
Join Date: December 1, 2002
Posts: 2,828
"It is there so the bullet doesn't push farther into the case."

Correct, and it isn't a "crimp", it's a cannalure.
wncchester is offline  
Old May 17, 2012, 05:46 PM   #4
moxie
Senior Member
 
Join Date: October 17, 2006
Location: TX
Posts: 513
It is a case cannelure, and won't interfere with reloading. You can ignore it.
__________________
If you want to shoot...shoot...don't talk! Tuco

USAF Munitions 1969-1992
RVN 1972-1973
moxie is offline  
Old May 17, 2012, 05:57 PM   #5
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 10,598
It is largely for identification, a wadcutter is not very likely to suffer bullet setback, even in a M52 or Super conversion.

The brass reloads normally.
Jim Watson is offline  
Old May 17, 2012, 06:40 PM   #6
marklyftogt
Senior Member
 
Join Date: March 11, 2012
Location: Salinas, CA
Posts: 137
I am using these in a S&W model 66 so it looks like I am fine.
Thanks for the education!
marklyftogt is offline  
Old May 18, 2012, 07:51 PM   #7
res45
Senior Member
 
Join Date: September 15, 2007
Posts: 548
The cannalure on the HB wadcutter loads serves two purposes to secure the bullet in the case and to provide uniform ignition. Speer did test several years ago on various degrees of crimp with wadcutter loads and found that those with little to no crimp didn't group well.

Depending on the depth of the cannalure in lots of case it will almost disappear after several firings and resizing. Back in the day when I use to shoot HB wadcutters I seated them flush and used a light roll crimp.
res45 is offline  
Old May 19, 2012, 08:29 AM   #8
Slamfire
Senior Member
 
Join Date: May 27, 2007
Posts: 3,868
Quote:
Speer did test several years ago on various degrees of crimp with wadcutter loads and found that those with little to no crimp didn't group well.
Very interesting. I always applied a little roll crimp on my 148's so the things would enter the chamber, never shot them without a crimp.
__________________
If I'm not shooting, I'm reloading.
Slamfire is offline  
Old May 19, 2012, 08:49 AM   #9
dahermit
Senior Member
 
Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 3,505
I have observed .38 Special cases that had the channelier in the position to keep a bullet from being pushed too deeply in the case and some with the channelier so close to the case head that the channelier could not have been applied for the purpose of preventing bullet set-back. One would conclude that its purpose may have been cosmetic.
__________________
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".

If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill?
dahermit 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 01:31 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2013 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.08708 seconds with 9 queries