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Thread: ,393 British large chambers

  1. #21
    Boolit Master 303Guy's Avatar
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    I have some South African PMP cases. They have a smaller capacity than all the others I have measured. So perhaps the web area is thicker and stronger. I used them in my short barrelled pig gun because of the smaller case capacity.

    I made a few neck sizers and expanders for minimum sizing to get the ID I need. Ideally, there should be no expanding required but my sizer is for jacketed's and it works just fine for that purpose. For paper patching or cast I expand to the size required and it basically stays there.
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  2. #22
    Boolit Master Texas by God's Avatar
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    At last they are all gone. They were Remingtons and Winchester. I've started it fresh with PPU factory loads.

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  3. #23
    Boolit Master Outpost75's Avatar
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    This is a WRA drawing which dates from the Lend-Lease period and was later revised postwar, its dimensions being similar to the SAAMI chamber:

    Attachment 211568
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  4. #24
    Boolit Bub
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    I have a MK II that went through FTR in the 50s that has a chamber like that, like new bore.
    Here is a link to some of my 303 cases.

    http://castboolits.gunloads.com/show...field-chambers
    mr

  5. #25
    Boolit Buddy Idaho Mule's Avatar
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    When loading cast in my 303's I use an 8x57 size die, on the neck ONLY. All 4 of the chambers I load for will accept this, and I am using NOE 316299 bullets sized to .315. I am experimenting with reformed 30-40 brass (longer neck to utilize long chambers) but can not comment on results , yet. I am sure others have gone down this path before. JW

  6. #26
    Boolit Master 303Guy's Avatar
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    I have one chamber with a shorter than usual neck. I know it's shorter because longer cases fired in it have this tapered mouth tell tale.

    Good idea on the 8x57 die.

    It's interesting that with a head separation there is no gas leak - or at least, not when I had them. My last head separation was in my early days with my first Lee Enfield back in the seventies. My uncle, a retired gunsmith, gave me that tip for leaving the case lube on the cases at that time. Never looked back.
    Last edited by 303Guy; 01-16-2018 at 12:38 AM.
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  7. #27
    Boolit Master madsenshooter's Avatar
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    Quote Originally Posted by Idaho Mule View Post
    When loading cast in my 303's I use an 8x57 size die, on the neck ONLY. All 4 of the chambers I load for will accept this, and I am using NOE 316299 bullets sized to .315. I am experimenting with reformed 30-40 brass (longer neck to utilize long chambers) but can not comment on results , yet. I am sure others have gone down this path before. JW
    You can make some longer cases from .303 blanks that are on the market now. Don't shoot them first, the crimp sometimes splits back too far, ruining the neck. I made 30-40 from them, during the recent shortage of 30-40.
    "If people let the government decide what foods they eat and what medicines they take, their bodies will soon be in as sorry a state as are the souls of those who live under tyranny."

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  8. #28
    Boolit Buddy Idaho Mule's Avatar
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    Quote Originally Posted by madsenshooter View Post
    You can make some longer cases from .303 blanks that are on the market now. Don't shoot them first, the crimp sometimes splits back too far, ruining the neck. I made 30-40 from them, during the recent shortage of 30-40.
    Thanks madsenshooter, I will keep my eyes open and procure some if they should become available in my area. BTW I have only "ruined" 31 of the coveted 30-40 brass to date, so don't shoot me !!! JW

  9. #29
    Boolit Buddy Gunfreak25's Avatar
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    I neck size fired HXP brass in my only No.4 with my 7.65 Belgium RCBS FL die. Works great, I stop just short of the shoulder and leave a little donut for neck support. I use the 7.65 seater too. I expand with an NOE plug to .311. I don't like oiling cases as it does increase stress on the bolt lugs, I have a calculator for this somewhere. O ring is the best method but is cumbersome for me even. I deal with the bulge and neck size.



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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