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Thread: Anyone shooting 170-180 GN 300 Blackout Supersonics???

  1. #1
    I'm A Honcho! bluejay75's Avatar
    Join Date
    Mar 2017

    Anyone shooting 170-180 GN 300 Blackout Supersonics???

    Greetings Gents,

    Anyone shooting 170-180 GN 300 Blackout Supersonics??? Please share your powder and Boolit combination. Im wanting these to run in a PSA 9.5 inch pistol and a 16 inch CZ Bolt gun.

    My finished Boolit actually weighs 175 grains and I have the following powders AA9, H110, 2400, 300 MP.

    This is the Boolit.

    Any comments welcome.

    You never know how you rank amongst men 'til you have seen what will break another man.
    The original "Bluejay" US Army/ US Navy 1945-1970.

  2. #2
    Boolit Master popper's Avatar
    Join Date
    Jun 2011
    170gr. PB & 185gr GC, RD style with slightly smaller meplat. 4227,cfe blk & 1680, ~14gr. Not done testing but they work (10" 1:8 pistol). Alloy still needs to be pretty hard at any 'book load' fps.

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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