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Thread: Throat or bore

  1. #1

    Throat or bore

    Hello All.

    Just a quickie, when using GC's do you size the bullet/GC to throat dia or bore dia.

    Thanks E/T

  2. #2
    Boolit Master Rcmaveric's Avatar
    Join Date
    Jul 2017
    Jacksonville, FL
    Size them to what you size your bullets to. IE. If you size to throat, size them to throat. If you size the .002 over grove then size them to that. Ext..

    If you want use them as cast run them through a sizer small enough to crimp the check, but large enough it doesn't size the bullet.
    "Speak softly and carry a big stick; you will go far."
    ~Theodore Roosevelt~

  3. #3
    Thanks Rc, Im using as cast for 303Brit at the moment 0.314" they shoot quite well but need a bit more oooph. Again Thanky kindley. E/T

  4. #4
    Thank you Matey. Im loading for 303Brit at 0.314, they shoot quite well but need a bit more oooph. Ill try the GC's

    Thanky kindly E/T

  5. #5
    Boolit Master

    texassako's Avatar
    Join Date
    Jul 2012
    North Texas
    I usually try them from bore size up to throat size in rifles, kind of depends on how long the throat is. Usually sizing to the throat has worked best for me, even if the bullet is smaller (GC bigger than bullet). My M28/76 is a good example of that liking an unsized .310" NOE 311331 with the GC crimped on with a .311" die. Throat is a long one at .311" but the bore is only about .3085".
    Back in the land of boolits.

  6. #6
    Boolit Master
    Join Date
    Jul 2014
    Good advice above. I do something similar for my 91-30. My mould drops just over .313" so I use a .314" push through die to crimp the gas check. It has always worked well.

    Well not always the gas check diameter was marginal but I set up the mold and bored them a couple thousands larger.


  7. #7
    Boolit Master

    Larry Gibson's Avatar
    Join Date
    Jul 2005
    Lake Havasu City, Arizona
    Size bullet/GC to throat diameter. Exception being some MN chamber throats won't allow that.
    Larry Gibson

    “Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
    ― Nikola Tesla

  8. #8
    Ok sounds good ,,,,,,,,,,, "MN" ?????

  9. #9
    Boolit Master Outpost75's Avatar
    Join Date
    May 2013
    over the hill, out in the woods and far away
    MN = Moisin-Nagant.

    Expect some wartime .303 "trench chambers" may have throats larger than max. gascheck diameter also, but if bullet "fits" otherwise, at higher velocities you will get better results with the GC than without it. It may take some experimentation to see how large a push-through sizer you can use and still crimp the GC on the heel of the bullet.

    My CBE mold from Australia has a large GC heel and I am able to crimp Hornady GCs on at .315" diameter. My NOE #314299 will also, but GC heel on older Lyman mold is too small to do so.

    Not sure which powders you have available in UK but I use 30 grs. of Alliant RL7 with #314299 for about 2000 fps from my Long Branch No.4 and it shoots more accurately than Greek HXP MkVII back to 600 yards.
    The ENEMY is listening.
    HE wants to know what YOU know.
    Keep it to yourself.

  10. #10
    Im sizing on a Lyman 450 so can set the depth to just crimp the G/C. Im casting from a Lee 185g that throws 0.314" and seating into the lands just enough to mark the nose. This bullet has quite a deep heel for the G/C I was wondering if anyone makes a deep G/C about 0.125 would be just the job

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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