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Thread: Core seating die.

  1. #1
    Boolit Master



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    Core seating die.

    What diameter ream should I use prior polishing/lapping should I be using to make a core seating die? The point forming die is .358. I was thinking about .356 but don't know how difficult it would be to lap .002 .
    Thanks ,
    Bill

  2. #2
    Boolit Master lead chucker's Avatar
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    The core seat die should be at least a thousandths smaller than your point form die so the point form die can bump it up to size. Makes the core jacket a tighter fit.
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  3. #3
    Boolit Master lead chucker's Avatar
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    .354 to .355 that way you can polish it to size. That way you can get any scratches out of it from the reamer.
    Dont pee down my back and tell me its raining.

  4. #4
    Boolit Master
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    It depends on how deep the scratches and machine marks are. You want to end up about a half thousandth under final point forming diameter.
    Nozombies.com Practical Zombie Survival

    Collecting .32 molds. Please let me know if you have one you don't need, cause I might "need" it!

  5. #5
    Boolit Master



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    Thanks, my thoughts were .356, however I have never lapped/polished steel, only homemade aluminum core molds.
    Bill

  6. #6
    Boolit Master lead chucker's Avatar
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    half thousandths from finished would be better. The better you polish it the better every thing ejects from the die.
    Dont pee down my back and tell me its raining.

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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