Load DataMidSouth Shooters SupplyReloading EverythingLee Precision
WidenersRepackboxRotoMetals2Inline Fabrication
Titan Reloading
Results 1 to 5 of 5

Thread: Shoulder Collapse...

  1. #1
    Boolit Master

    Join Date
    Mar 2005
    Location
    WESTERN PENNSYLVANIA
    Posts
    2,138

    Question Shoulder Collapse...

    Not sure where to post this, but since it concerns brass--here it is...

    What is causing the shoulder to collapse when I am expanding the neck to 0.310" after it has been resized?...

    This brass is R-P 30-40 Krag and has been annealed and probably reloaded at least 10 times...

    Just case fatigue?...

    Thanks...BCB
    Attached Thumbnails Attached Thumbnails 000_3091.jpg  

  2. #2
    Boolit Master


    Join Date
    May 2015
    Location
    Anchorage, AK
    Posts
    1,113
    Are the inside of the neck clean? You might need to swirl a qtip on the inside with some sizing wax/lube.

  3. #3
    Boolit Master
    Join Date
    Mar 2005
    Posts
    4,612
    When you expand it with a mandrel from the mouth there is no support for the case body from your die. When a shoulder on the expander mandrel shoulder hits the case mouth the case will collapse since it is not as strong as the die. If you are using an M die make sure the top shoulder does not bottom out against the case mouth.

    There are a number of things that might help

    1. More lube on the expander
    2. Less annealing of the shoulder
    3. Expand with a .310 expander ball on the decapping rod pulling rather than pushing on the brass.

    When a case fatigues it work hardens and cracks. That is why you anneal the brass.
    EDG

  4. #4
    Boolit Master

    rancher1913's Avatar
    Join Date
    May 2015
    Location
    plains of colorado
    Posts
    3,640
    when some did that on my 25-06 it was die adjustment. try backing your die away from the ram until it does not crush the brass anymore and then see if the neck size is still ok.

  5. #5
    Boolit Grand Master
    Mk42gunner's Avatar
    Join Date
    Aug 2005
    Location
    Butler, MO
    Posts
    9,020
    It sure looks like over annealing to me.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check