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Thread: AR15 300BO Knowlege needed

  1. #1
    Boolit Master Littlewolf's Avatar
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    AR15 300BO Knowlege needed

    my mold list from lightest to largest

    311410 = 130gr pb
    311414 = 150gr gc
    311-165 = 165gr NOE Ranch Dog gc
    311413 = 169gr gc
    311291 = 170gr gc
    311329 = 185gr gc
    316299 = 210gr gc

    can anybody recomend for supersonic / and or reliably cycle use in a 16.1" barrel carbine gas system

    powders i have

    imr 4227
    h110/w296
    2400
    4198
    4895
    herco

  2. #2
    Boolit Master
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    Personally, for SS loads, I'd go with any of the top 3 bullets and any of the top 3 powders. I've used all of them in just about every possible combination with decent results.

  3. #3
    Boolit Master popper's Avatar
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    4227, 110 the RD may not feed
    Whatever!

  4. #4
    Boolit Master



    curator's Avatar
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    The top three powders work well for the .300BO supersonic. I am partial to AA1680 for that task but you don't list it. Lyman 311410 might work with subsonic depending on your rifling twist but will be a disappointment past 1200 fps. It will need a gas check in fast twist barrels. The only other boolits I have experience with are #311291 (an excellent choice for most .30 caliber rifles) and #311413 which may not feed because of its wide meplat, If it feeds it will shoot well out to 1800 fps. Lastly #316299 will be too large to chamber. Now if you meant #311299, that would be a good choice providing it will chamber. The nose portion on this boolit can vary from .298 to .306 as made by Lyman. Ideal for .300 BO would be .301 nose and .311 bearing area. I shoot this same boolit both supersonic and subsonic with good results in my 1 in 8" twist rifle.
    Last edited by curator; 05-30-2018 at 09:20 PM.

  5. #5
    Boolit Master
    Elkins45's Avatar
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    The meplat on the RD might not feed, and the 311299 might not fit your throat. I have had very good performance with the 311291. Any of the top three powders are good choices, but I find 2400 to give me a little cleaner burn than the other two.
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  6. #6
    Boolit Master popper's Avatar
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    2400 will cycle a carbine gas AR?
    Whatever!

  7. #7
    Boolit Master

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    Quote Originally Posted by popper View Post
    2400 will cycle a carbine gas AR?
    15grs cycles mine
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  8. #8
    Boolit Master Littlewolf's Avatar
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    the 316299 isnt a typo, i ordered it large from NOE for my 1944 SMLE #4MK1. my BO is a 16.1" 1/8twist.

  9. #9
    Boolit Master Littlewolf's Avatar
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    are there any thoughts towards 185gr i know the 311329 as well as the 311414 have been discontinued for over 40 years

  10. #10
    Boolit Master RU shooter's Avatar
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    Not that mould but the Lee 185 shot rather well when I had a 300 I never went for top speeds just what would function my rifle I normally used RE7 and 4198 I even had good results with 4895 with a lot of different bullets . Mine was a 20" 12 twist barrel with carbine length gas tube I ordered just for shooting cast bullets at normal speeds .
    If you find yourself in a fair fight, your tactics suck!

  11. #11
    Boolit Master


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    311414 = 150gr gc with 13.0 grains of 296 tested and true, in a 16 inch barrel on multiple rifles.
    "Yes or no will almost always suffice as the answer"

  12. #12
    Boolit Master
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    If you go subsonic the carbine length may not cycle. I have a carbine length for super sonic and a pistol length for sub sonic. Saves having to re-zero just to change ammo.

  13. #13
    Boolit Master
    sutherpride59's Avatar
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    There is a group buy that just closed but is still taking a few more buyers for a blackout specific 130grn with a hollow point option. You can still jump in on it if you want.

    http://castboolits.gunloads.com/show...Blackout-other

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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