Uneven expansion of fired cases

Uneven expansion of fired cases

This is a discussion on Uneven expansion of fired cases within the Cartridges & Calibers forums, part of the Sniping Related category; this might be nothing other than my noobishness but... I've noticed that when I'm trimming the fired cases (Norma 7.5X55 with 50gr H4831 168grSierreMK) not ...

Page 1 of 3 123 LastLast
Results 1 to 10 of 25
  1. #1
    Senior Member Pen&Sword's Avatar
    Join Date
    May 2009
    Location
    San Diego, CA
    Posts
    1,220

    Uneven expansion of fired cases

    this might be nothing other than my noobishness but...

    I've noticed that when I'm trimming the fired cases (Norma 7.5X55 with 50gr H4831 168grSierreMK) not all the cases either need the same amount trimmed or any at all. Is this normal? Could my charges be uneven and hence some expand more than others?

    I'm using a Lee case trimmer and am careful to make sure the case is locked in tight to the shellholder.

    Cheers
    "What we do for ourselves, dies with us. What we do for others and the world remains and is immortal." Albert Pine

  2. #2
    Senior Member FluffyTheCat's Avatar
    Join Date
    Oct 2005
    Posts
    2,596
    Don`t worry. There`s nothing wrong.


    Fluffy
    I'm a genius. And you are not.

  3. #3
    Administrator
    Join Date
    Apr 2006
    Posts
    5,234
    Pretty normal, it's even worse in autoloaders.

    Nothing to worry about. I have found that my .220Swift reformed 6.5x51SR "Arisaka" cases exhibit this phenomenon to a MUCH lesser degree. I attribute this to the case neck annealing I do after every firing.

    Keepin mind also, that your sizing operation has an appreciable effect on this dimension as well. Try this: size, trim, size again, and try to trim the case: I bet you'll find the cutter will remove about a thou' again...:wink:

    Back to brass smashin'..
    -Nate
    NRA A2 Service Rifle High Master XTC
    NRA A2 Service Rifle Expert LR
    President's Hundred
    US Distinguished Rifleman
    NRA Silhouette AA

  4. Remove Advertisements
    SniperForums.com
    Advertisements
     

  5. #4
    Senior Member Pen&Sword's Avatar
    Join Date
    May 2009
    Location
    San Diego, CA
    Posts
    1,220
    Thanks chaps.

    Nat, how do you do the annealing ? I read a review of the brass I'm using where the reviewer said annealing the brass every 3 discharges makes it last for 12 discharges. I don't have a special oven to do this. Any alternatives?

    Cheers
    "What we do for ourselves, dies with us. What we do for others and the world remains and is immortal." Albert Pine

  6. #5
    Senior Member
    Join Date
    Jan 2008
    Posts
    2,088
    Annealin the cases are pretty simple once you kill afew cases learning how.. When i started doing it i picked up abunch of cases from therange to practice on.

    In about aweek i'm going to post a pretty lengthy video on youtube about this same thing.

    I started doing this to all my bench brass and alot of my brass for all my rifles.

    I am getting about 20-25 loadings out of my300win brass befor i see any sings of problems.

    Tom

  7. #6
    Administrator
    Join Date
    Apr 2006
    Posts
    5,234
    Pen, I gotta go, but I'll write some on this tonight.

    DO NOT anneal without understanding how/why....and NO ovens!

    ...2nd Best way to kill yourself with a rifle.

    -Nate
    NRA A2 Service Rifle High Master XTC
    NRA A2 Service Rifle Expert LR
    President's Hundred
    US Distinguished Rifleman
    NRA Silhouette AA

  8. #7
    Senior Member SpaceGoD's Avatar
    Join Date
    Oct 2007
    Location
    Austin, TX
    Posts
    966
    6mmbr has a good article on it:

    http://www.6mmbr.com/annealing.html

    I will probably be annealing for my 338 brass. Interested to hear how you guys are doing it.
    Walther P99 9mm/AAC Evo
    Noveske Afghan AR15/WOTAC 4-14/Ops Inc 12th
    Desert Tactical SRS 338/TBD/Tac Ops 338
    Tac Ops Tango/Hensoldt 4-16/Tac Ops 30

  9. #8
    Senior Member Pen&Sword's Avatar
    Join Date
    May 2009
    Location
    San Diego, CA
    Posts
    1,220
    great article SG, thanks.

    Big_boy & Nat, your public eagerly awaits...

    Cheers
    "What we do for ourselves, dies with us. What we do for others and the world remains and is immortal." Albert Pine

  10. #9
    Senior Member
    Join Date
    Jul 2009
    Posts
    155
    lee trimming equip is sloppy, i couldnt evenly cut cases with it.
    What was that ?

  11. #10
    Senior Member
    Join Date
    Jan 2008
    Posts
    2,088
    Pen

    When you have afew just pm with your email and i will email you alot of info on annealing. Like said very easy way of killing yourself thats why you want to pick up some range brass to practce on first.

    the youtube video is on the back burner tell i get fully healed i picked up an internal infection from surgery. Sorta limited on what i can do.

    Just ask and i will help.

    Items to look for befor you anneal.
    A drill mounted case holder from Sinclair,midway,brownells. I will get a pic and part number tonight.

    A cordless drill work pretty well or a corded, A good propane torch head you can adjust the flame on.

    THen most importan a place todo it away from any powder or spray cans.

    I take the drill and i build a wooden holder and i use plumbers banding to hold inplace with. Then take a zip tie to hold the trigger of he drill down i run my drill wide open i use a paint pen that is heat sensitve and mark my case with it. when they heat to what ever temp i choice he marker for i changes colors. i get those from sinclair or a welding supplie store. afteryou do a few thousand rounds you can watch the color of the brass change. After i see it change i will drop them in a pan of water to cool them. I had a old benchrest guy tell me that, you wount get alot of heat at the head. I have a few pics of the brass from start to finish not sure were all the pics went but this is a start.

    First is the basic tools i use



    Peice of brass in the holder




    Not sure were the pics are showing the brass in the heat. But i only old the case in the heat about 3/8 in so when the case starts heating an moving in to th body area i can watch my heat lines.

    Here you can see left to right. Left is to much heat-case is junk. second to left case-to deep in the flame no real color change on mouth case ok. Third from left. Perfect case- this is how the cases should look. fourth right case you can see the heat has been on thecase but no real annealing has taken place. This case i would redo to proper annealing. Far right is a case just fired no annealing at all.


    Here are some cases done afew months ago for my wifes 300win she doesn't shoot.


    I will look for the rest of the pics during the heating stage and cooling stage. but thats just have a bowl full of tap water so they cool faster.

    Hope that helps and any questions just ask away i'm more thanwilling to help out.


    Tom

Page 1 of 3 123 LastLast

Ads

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. Q About Case Head Expansion
    By Klopinger in forum Cartridges & Calibers
    Replies: 26
    Last Post: 09-19-2011, 11:14 PM
  2. scratched cases ?
    By cbsherrod in forum Rifles
    Replies: 7
    Last Post: 06-16-2009, 06:42 PM
  3. cases-how many reloadings?
    By ZanderPommo in forum Cartridges & Calibers
    Replies: 10
    Last Post: 04-23-2009, 11:51 AM
  4. cases
    By babyboom in forum Off Topic
    Replies: 8
    Last Post: 04-15-2009, 01:24 PM

Search tags for this page

case uneven expansion

,
fired case expansion
Click on a term to search for related topics.