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Thread: What size drill bit

  1. 01-17-2021, 08:28 PM #1
    ACC
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    What size drill bit

    I am experimenting and need a drill bit that is close to .358 inj diameter. What fractional drill bit is close.

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  2. 01-17-2021, 08:31 PM #2
    sparkyv
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    23/64" is 0.359". Is that close enough?
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  3. 01-17-2021, 08:45 PM #3
    FLINTNFIRE
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    You would want a T size
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  4. 01-17-2021, 10:14 PM #4
    M-Tecs
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    This chart shows you what available in letter, number and metric in addition to fractional. Drill bit always drill oversize and they don't produces perfectly round holes. 1% to 5% oversize is normal for drill bits finished hole sizes.

    https://www.abbottaerospace.com/wp-c...ze-Chart-1.jpg
    Last edited by M-Tecs; 01-17-2021 at 10:29 PM.
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  5. 01-17-2021, 10:48 PM #5
    Moleman-
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    drill undersize and use a reamer.
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  6. 01-18-2021, 11:57 AM #6
    JonB_in_Glencoe
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    You may get better advice if you told us your plans.

    If you are removing a GC shank from a 358 mold, something I have been thinking about doing, you can search Ben's posts, as he has done that and has a real good technique that your average Joe can do with a drill press...and he used a 23/64" HSS Straight Shank Straight Flute Chucking Reamer, which isn't much more expensive than a real good drill Bit.

    If you are doing that, or something else but still having to do with mold cavities, be aware that standard Drill bits don't make round holes.
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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