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 > Ammo and Reloading
Register FAQ Members List Calendar Mark Forums Read

Ammo and Reloading Factory Ammunition, Reloading, Components, Load Data and more.

Reply
 
Thread Tools Display Modes
  #1  
Old 12-30-2012, 10:24 AM
gsparesa's Avatar
gsparesa gsparesa is offline
Senior Member
 
Join Date: Nov 2008
Location: Fremont, CA
Posts: 564
iTrader: 0 / 0%
Default Bullet Recoil Movement (creep)

I need to gain ammunition case malleability knowledge from you reloading experts. Does pistol/revolver brass loose it's rigidity around the neck the more rounds spent? I started with new Remington brass and used 3/4 turn on my Lee factory crimp die to create a roll crimp. This is my 3rd time reloading these rounds and now I'm starting to see bullet recoil movement (creep). The round on the top in the picture has not been fired in my 5" 629. The round at the bottom was the sixth round in the cylinder after the other five rounds were fired. The bullet creep shows movement towards the back of the bullets cannelure. The crimp is still within the cannelure and is probably normal movement but I don't like visually seeing any movement. I've been using 240 gr HP-XTP bullets in front of 20.5 gr of 2400. I think I will give it a stouter crimp, more towards 1 full turn on my Lee factory crimp die. I just don't feel the pressure on the presses handle when forming the roll crimp like I did when the cases were new. I'll be purchasing Starline brass in the future to do a comparison.


Reply With Quote
  #2  
Old 12-30-2012, 11:56 AM
Fjold's Avatar
Fjold Fjold is offline
I need a LIFE!!
 
Join Date: Oct 2005
Location: Near Bakersfield
Posts: 20,603
iTrader: 26 / 100%
Default

You can adjust the crimp tighter or adjust the bullet seating stem so that the bullets are seated so that the crimp is at the back of the channelure where it shows in picture 2.

You're crimping in the cannelure where the bullet diameters is the smallest, if you crimp at the very back of the cannelure the crimp will hold it more securely and it won't creep any further.
__________________
Frank


One rifle, one planet - Holland's 375

http://img.photobucket.com/albums/v214/Fjold/member8325.png

Life Member NRA, CRPA and SAF
Reply With Quote
  #3  
Old 12-30-2012, 12:39 PM
Bill Steele Bill Steele is online now
Veteran Member
 
Join Date: Sep 2010
Location: Idaho
Posts: 4,663
iTrader: 55 / 100%
Default

Generally, brass will work harden as it is continually sized. This hardening will cause it to be more springy and you will lose neck tension and the roll crimp will spring back away from the bullet more than new brass. You can anneal the brass up by the case mouth and it will help, or as Fjold recommened, just crimp down more where it stops creeping. I am actually surprised you are getting that many loads out of your .44RM brass, I get 4 best case.
__________________
When asked what qualities he most valued in his generals, Napoleon said, "give me lucky ones."
Reply With Quote
  #4  
Old 12-31-2012, 11:15 AM
dixieD's Avatar
dixieD dixieD is offline
CGN/CGSSA Contributor
CGN Contributor
 
Join Date: Jun 2006
Location: Antioch, Kalifornistan
Posts: 2,634
iTrader: 0 / 0%
Blog Entries: 1
Default

Quote:
Originally Posted by Fjold View Post
You can adjust the crimp tighter or adjust the bullet seating stem so that the bullets are seated so that the crimp is at the back of the channelure where it shows in picture 2.

You're crimping in the cannelure where the bullet diameters is the smallest, if you crimp at the very back of the cannelure the crimp will hold it more securely and it won't creep any further.
This is interesting. If you are loading for a lever gun, would it then be wise to seat to and crimp at the upper edge of channelure? My concern with levers is the bullet seating due to recoil.
__________________
As Einstein has shown that it takes infinite energy to accelerate a mass to the speed of light, Obama AND THE AMERICAN PEOPLE will demonstrate that it takes infinite money to attain utopia
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 10:43 AM.




Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2016, 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 2002-2016, Calguns.net an Incorporated Company All Rights Reserved.