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Thread: Heat treating then powder coating

  1. #1
    Boolit Master
    Join Date
    Mar 2005
    Spokane, Wa.

    Heat treating then powder coating

    If you heat treat a bullet and then powder coat it at 400 degrees and slowly let the bullet cool, is the hardness that was obtained by heat treating reduced?
    It's all chicken, even the beak!

  2. #2
    Boolit Mold
    Join Date
    May 2020
    Yes! But you can harden PCed bullets when you drop them in cold water.
    Here an article about heat treating. I PC for 20 min at 200°Celsius and drop them in water. My alloy hardens to 25 after a few weeks.

  3. #3
    Boolit Grand Master popper's Avatar
    Join Date
    Jun 2011
    Molecules move around in a solid metal, higher temp, more movement. It takes time at temp to get them arraigned right. Temperature of quenching water determines the rate (faster is better) of cooling and resultant hardness.
    I cook my PCd bullets for one hour @ 400 F then into ice water for highest BHN. Alloy, time and temp determine the BHN.

  4. #4
    Boolit Master

    Join Date
    Nov 2014
    'Bout a hundred miles from the Gulf of Mexico
    PC’ed Rifle slugs get one hour at 420*F, then quenched in ice water, PC’ed pistol slugs 30 minutes, no quenching, no leading so far!!
    Air cooled cast rifle slugs, then size and gas check,powder coat, then size and load after two weeks of resting time.
    No leading in 308 win. At 2600+ FPS
    Just my opinion and results

    Alloy is 50/50 ww/ pure with 2% tin.
    I firmly believe that you should only get treated by how you act, not by who or what you are!!

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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