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Thread: 300 Blackout Cast loads

  1. #1
    Boolit Buddy
    Join Date
    Dec 2009
    Location
    Just outside New Orleans
    Posts
    400

    300 Blackout Cast loads

    I have some 311365 and was told to use the starting 220 loads for jacketed. it is 200 grains
    I also have the RCBS 115 GC mold Maybe the same 125 Jacketed start loads
    Thoughts?

  2. #2
    Boolit Master
    Join Date
    Feb 2015
    Location
    Central Iowa
    Posts
    938
    Are you going for subsonic loads with the 200 grain bullet? Bolt action or semi-auto?

    Most subsonic loads are at the very bottom end of the load data and there'a a balancing act between cycling the gun and going supersonic.

    The lighter bullets are very short and might have feeding issues. 125 grain data is a useful reference for 115 grain bullets. Actual load development will depend on your goals and what type of gun being used. A bolt action will be much easier to work with.

  3. #3
    Boolit Grand Master popper's Avatar
    Join Date
    Jun 2011
    Posts
    8,798
    from hodgdon reloading site, 9 gr. of 296/110, 4227 or cfeblk(1680) will do. 9gr 2400 works too.
    Whatever!

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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