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Thread: Blow back

  1. #1

    Blow back

    I formed 30/06 brass to 7.65x53 Argentine formed then annealed loaded 167grn cast coated from 18-20 grns of imr 4198 and felt chucks hit my face cases are all full of soot accuracy 3-4" at 50yrds but I would get one 6" flyer. I have been loading since the 60s but never loaded cast bullets it sure is different just signed on last week hope I'm doing this right.

  2. #2
    Boolit Master
    Join Date
    Mar 2005
    Posts
    3,456
    Review your load data to see if it can be boosted a grain or 2 to raise the pressure. Slightly higher pressure might make the case necks seal better.

    Tilt your muzzle upward to make the powder settle back against the primer.
    EDG

  3. #3
    Boolit Master Outer Rondacker's Avatar
    Join Date
    Mar 2014
    Location
    NY in the Adirondacks
    Posts
    1,135
    100yrdopenchamp welcome to the addiction. Many here will jump in to help out with any issues you have. Might be a bit slow since the holiday weekend but shortly after the answers will come.
    Stop being blinded by your own ignorance.

  4. #4
    Boolit Master Rcmaveric's Avatar
    Join Date
    Jul 2017
    Location
    Jacksonville, FL
    Posts
    698
    second double checking the load manual. Sounds like low pressures caused the cases not to full swell and seal the bore also resulting in a dirty burn. I have never been hit with anything in the face. But i have had soot leak into my chamber and dirty ignitions while experimenting with uncharted powders. Sometimes increasing the charge will cure it or try another listed powder. Looking at my Cast Bullet Handbook i don't have a 167 Gr listed, but it does have the 170 listed and you get several grains to go before ma.
    "Speak softly and carry a big stick; you will go far."
    ~Theodore Roosevelt~

  5. #5
    Boolit Master
    Join Date
    Nov 2017
    Location
    brisbane ,qld,australia
    Posts
    431
    A simple cure is to flare the case neck for the cast bullet,and leave the flare.It will size to neck dia as its loaded,and seal the gases while pressure builds up.Unless the chamber neck is hopelessly oversize,which can happen in old milsurps.Another simple cure is to make your reformed case slightly long in the shoulder,and it will seal there as the bolt closes and forces the metal contact.Even in a 91 Mauser,you shouldnt get gases in the face....some other rifles ,yes.

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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