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Thread: 300 AAC Brinnell hardness needed

  1. #1
    Boolit Mold
    Join Date
    Apr 2011
    Location
    North Carolina
    Posts
    10

    300 AAC Brinnell hardness needed

    I am currently shooting berry 220 gr copper coated bullets along with 10.6gr of H4198 for a subsonic load in 300 AAC.

    Plan on casting 230gr soon in LEE mold then powder coating with Smokes black

    My first thought is low velocity load so Brinnell of 12 (wheelweights) would be plenty but after reading more I see this little load will produce pressure around 20,000 and hardness needs to be higher.

    I have plenty of linotype, magnum shot, tin, wheelweight ingots.....just need help figuring out what hardness to make boolitz.

    My current thought is half ww half linotype and water quench....just a WAG on my part though...I do not want dem boolitz ANY harder than they need to be.

    HELP

  2. #2
    Boolit Grand Master

    DougGuy's Avatar
    Join Date
    Apr 2013
    Location
    just above Raleigh North Carolina
    Posts
    5,101
    You may get the hardness you need with wqww.
    Got a .22 .30 .32 .357 .38 .40 .41 .44 .45 .480 or .500 S&W cylinder that needs throat reaming? 9mm, 10mm/40S&W, 45 ACP pistol barrel that won't "plunk" your handloads? Shoot me a PM! Also on Facebook: https://www.facebook.com/Cylinderhone-756429174391912/

  3. #3
    Boolit Master mattw's Avatar
    Join Date
    Oct 2014
    Location
    East Central Illinois
    Posts
    839
    I am running 94/3/3, so hardness somewhere around 15. I am able to shoot them in an AR at 1800fps with no leading. I powder coat most, but have shot several without PC. I suspect with a gas check that most decent alloys would be fine and at that weight, you are going to be in subsonic land and may even be better off.

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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