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Thread: 300 BLK Powder Question

  1. 09-30-2019, 05:14 PM #1
    Ed_Shot
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    300 BLK Powder Question

    Just starting out with a new 300 BLK AR. I'm using the Lee 312-155-2R with both IMR 4227 and RL-7. Would like to try Alliant 300-MP. Done a lot of reading but data is scarce. My COAL with the 155 gr. is 2.00" sized .310. Would appreciate words of wisdom on a start and max charge of 300-MP with this 155 gr. boolit.
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  2. 09-30-2019, 07:25 PM #2
    popper
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    Sierra shows loads for their 150GD, 17.2=1786,19=1960max. Should be very close.
    Whatever!
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  3. 10-06-2019, 05:44 PM #3
    Gunnut 45/454
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    Haven't used RL7 so no help there. My powder for this bullet is Lil Gun 15.5 gr under the Lee 155gr runs about 1875 fps. And gives 1-1.5" groups at 100 yards.
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  4. 10-12-2019, 10:21 PM #4
    arjacobson
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    Quote Originally Posted by Gunnut 45/454 View Post
    Haven't used RL7 so no help there. My powder for this bullet is Lil Gun 15.5 gr under the Lee 155gr runs about 1875 fps. And gives 1-1.5" groups at 100 yards.
    Same here.. LIL gun has worked great for me..
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  5. 02-08-2020, 02:03 PM #5
    Stuckcase
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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