RotoMetals2WidenersInline FabricationRepackbox
StainLess Steel MediaGraf & SonsMidSouth Shooters Supply

Results 1 to 7 of 7

Thread: Brass Not Sizing Properly

  1. #1
    Boolit Bub forrest-hunter's Avatar
    Join Date
    Jun 2014
    Location
    Spring, Texas
    Posts
    66

    Brass Not Sizing Properly

    I'm reloading 300 win mag using Lee dies - most of the loaded shells feed like butter but about 10% are locking the bolt or won't chamber completely- the brass has been loaded before with no problems - the loaded bullets do fit fine in my Wilson go-no go die - rifle is weatherby vanguard

  2. #2
    Moderator



    Join Date
    Dec 2005
    Location
    Oregon Coast
    Posts
    4,224
    You can color the cases with a black Sharpie and chamber them. The black ink will rub off where the case is coming into contact with the chamber and tell you where the problem is. Once you determine the problem, then you can start working on a solution.

    Hope this helps.

    Fred
    After a shooting spree, they always want to take the guns away from the people who didn't do it. - William S. Burroughs.

  3. #3
    Boolit Master

    Rcmaveric's Avatar
    Join Date
    Jul 2017
    Location
    Jacksonville, FL
    Posts
    1,101
    Had that problem with my .270 Win cases most the case chambered fine but every now and then i wouldn't beable to close the bolt or the bolt was hard to close. I screw the resizing die till it contacts the shell holder. Upon resizing i noticed on the full stroke i wasn't touching the shell plate on the stroke of the handle. I started screwing the resizing die in a half turn after it contacts the shell holder. Now on sizing the shell holder contacts the bottom of the die and i haven't had any problems since.
    "Speak softly and carry a big stick; you will go far."
    ~Theodore Roosevelt~

  4. #4
    Boolit Grand Master

    Join Date
    Mar 2013
    Location
    Northwest Ohio
    Posts
    9,266
    Sizing belted mag cases can be tricky at times. The case is meant to headspace on the belt but sizing for this moves the shoulder back to far drastically shortening case life. A lot size to just bump the shoulder back .001-.002 from fired dimensions. But on a tight cut chamber the head of the case might not be sized quite enough to easily chamber. Inking a problem case with a magic marker will show what you have ( where its tight) and then the proper fix can be determined. There are custom special dies that size the case correctly for longest life. I believe you can still send redding 3 fired cases and have a die made for the rifle. There are others that do this also I think warner ( the maker of the highly accurate rear apeture sight) also offers this service.

    I'm betting after a couple firings your case heads just ahead of the belt are expanded enough to be tight and may be in need of sizing a trick here is to use a bigger longer die witht the same body ( Maybe 375 H&H ) to size only the body then size the neck and bump the shoulder back as needed.

  5. #5
    Boolit Master
    Join Date
    Mar 2005
    Posts
    3,664
    If you find case drag or interference on the base in front of the belt it may take another die to control.

    The problem with using a longer die is the design of dies for belted rounds. Dies for belted rounds stop the shell holder against the die bottom before the top of the belt reaches the shoulder of the belt recess. When you set the die to accurately bump the shoulder back .001 to .002 the belt stops even further from the belt recess shoulder.

    You could modify a .458 Win die to size the area in front of the belt.

    Or you can cut off an extra belted magnum FL sizer body to get rid of the shoulder of the die. Then you would need to grind .010 to .020 off the bottom of the die to permit the belt to be driven up to the belt recess shoulder. This will resize all the case wall ahead of the belt.

    Larry Willis also makes a collet die that can size the area ahead of the belt. It is expensive but will size most belted rounds.

    http://www.larrywillis.com

    Click image for larger version. 

Name:	diesmall.jpg 
Views:	10 
Size:	10.1 KB 
ID:	215984
    Last edited by EDG; 03-08-2018 at 11:34 AM.
    EDG

  6. #6
    Boolit Mold
    Join Date
    Dec 2017
    Posts
    28
    http://www.larrywillis.com

    Click image for larger version. 

Name:	diesmall.jpg 
Views:	10 
Size:	10.1 KB 
ID:	215984[/QUOTE]
    This is a tool I will probably be getting soon for 3 in 7mm RM and a 300 WM. I have had some issue before on one of the 7mm with the bulge above the belt. I didnt use a marker but could see the rub marks on some. Looks like a good tool. I also use some Lee collet dies for neck sizing.

  7. #7
    Boolit Bub forrest-hunter's Avatar
    Join Date
    Jun 2014
    Location
    Spring, Texas
    Posts
    66
    Used a small base RCBS resizing die - seemed to solve the problem - all casing chamber properly - have also ordered the Larry Willis collet die -I normally buy once fired brass - have 7 mag, 300 mag, and 338 mag.- this die should solve most of my problems
    Last edited by forrest-hunter; 03-16-2018 at 07:23 PM.

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