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Thread: 300 blackout subsonic cb load data?

  1. #1

    300 blackout subsonic cb load data?

    anybody have a load they have worked up that will cycle the lee mold 300 blk 230 grain bullet subsonic?

  2. #2
    Boolit Master on Heavens Range
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    Any of the 680 "brands" will work. H116 is one as well. 11.0 grains plus or minus 0.5. Faster powders won't develop the delayed pressure required to consistently work the bolt. ... felix
    felix

  3. #3
    thank you felix i will now try and located some of these.

  4. #4
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    I dont know my exact charge, but I used Solo 1250. Worked better than Red Dot in that particular cartrige. Why, I dont know, but it was more accurate and seemed to work really well in my AR.
    I came into this world kicking, screaming, and covered in someone elses blood. I plan to go out the same way.

  5. #5
    i got mine shooting and cycling great with reloader 7. bullets were cycling at 950 fps. i stopped with 1050 fps with 10.2 grains and bolt locks back on last shot. im using a spikes tactical with wilson combat 16 inch match barrel and carbine length gas system no adjustable block.

  6. #6
    Boolit Master on Heavens Range
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    OK, then, stay with RL7. Your barrel system is faster than mine, and that is good for subsonic. The 680s are a tad slower, in general. Of course, each lot of each might show a reverse in practice. ... felix
    felix

  7. #7
    Boolit Bub Chrome1981's Avatar
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    Hello, i want buy an AR-15 ( i thought an Smith a Wesson Model M&P15 Sport) and an .300 BlackOut Upper receiver 12 inch barrel.
    I would like to use sub-sonic lead bullets, but the powder that is easier to find in Rome is Vihtavuori (69 Euros/Kg ).

    Could you suggest me some mold (i thought about NOE [311-247G-FN-2C-PB]) and reloading data ?

    what do you think about 12-inch barrel?

    thank you very much!!!
    My toys:

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  8. #8
    Boolit Master
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    Quote Originally Posted by Chrome1981 View Post
    Hello, i want buy an AR-15 ( i thought an Smith a Wesson Model M&P15 Sport) and an .300 BlackOut Upper receiver 12 inch barrel.
    I would like to use sub-sonic lead bullets, but the powder that is easier to find in Rome is Vihtavuori (69 Euros/Kg ).

    Could you suggest me some mold (i thought about NOE [311-247G-FN-2C-PB]) and reloading data ?

    what do you think about 12-inch barrel?


    thank you very much!!!
    Vihtavuori n110 would be my choice. It's a little expensive so I've not used it. Seen data for subs and supers. Data is subjective to gas port size and gas system length. For other mold options look at the Accurate 31-240e, it works really well in AR mags.
    I support your right to keep and arm bears.

  9. #9
    Boolit Bub Chrome1981's Avatar
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    Quote Originally Posted by Jupiter7 View Post
    Vihtavuori n110 would be my choice. It's a little expensive so I've not used it. Seen data for subs and supers. Data is subjective to gas port size and gas system length. For other mold options look at the Accurate 31-240e, it works really well in AR mags.
    Thank you very much can i try to give u other details of my future upper in .300 BLK:
    twist: 1/10
    gas-tube mid-pistol 12 cm

    I want buy only upper, no all carabineItalian vendor here.

    Here in Italy Vihtavuori is expensive too, but IMR, Hogdgon, Winchester are very rare and more expensive. (Accurate powders nerver seen)

    Thank you for mold now i'll send an email to ask them if they ship to Italy
    My toys:

    STI Spartan .45ACP
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  10. #10
    Boolit Master bikerbeans's Avatar
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    9.9 grains of H110 and the Lee 300AAC bullet (mine weigh 225g) cycles in my 16" 1:8 twist AR blackout. The lower is a Spikes with military buff tube and the standard buffer and spring. This load is supposed to be subsonic but I haven't chronied it to verify. CCI small rifle primers and a fairly strong lee factory crimp. Brass is converted Rem 223 commercial. OAL is 2.25"

    BB

  11. #11
    ^^^^that didnt work in mine i tried it up to 14 grs before i saw case pressure and still wouldnt cycle and was hitting 1450 fps

  12. #12
    Boolit Master
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    Quote Originally Posted by Crocks and Socks View Post
    ^^^^that didnt work in mine i tried it up to 14 grs before i saw case pressure and still wouldnt cycle and was hitting 1450 fps
    If 14grs h110 didn't cycle with a 200+gr boolit, you've got other problems. I've gotten 160's to cycle with 13gr charges. My 245's cycle at 10.2grs h110. Time to disassemble everything and clean. Measure your gas port, if it's below .095, it's too small. .125 with a carbine length gas system would be desirable. Check your gas tube for obstruction and
    either clean or replace. Also check gas port/gas block alignment.

    Edit to add: could also try a lighter buffer. 300aac was designed to run with a carbine gas and buffer system, suppressed or not.
    Last edited by Jupiter7; 05-20-2013 at 11:41 AM. Reason: Info
    I support your right to keep and arm bears.

  13. #13
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    Quote Originally Posted by Jupiter7 View Post
    Measure your gas port, if it's below .095, it's too small.
    Generally speaking, I'm +1 with the above advise... My gas port isn't .095 (.070 IIRC, CMMG bbl), but it's way bigger than the port on my 223 barrel... I think lots of guys are having trouble with short (or not) cycling because the port is too small, and there's insufficient gas vented to the system.

    I prefer fast rifle powder over magnum pistol powder, but that's just me. I've used both... I just shot 225 grain Hornady j-words and 235 grain cast (Accurate 31-235b) with 10.0, 10.5 and 11.0 grains of A-1680 through my Franken-15... All cycled the bolt, though 10.0 and cast boolits failed to lock the bolt open on the last round.

  14. #14
    Boolit Master

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    Quote Originally Posted by bikerbeans View Post
    9.9 grains of H110 and the Lee 300AAC bullet (mine weigh 225g) cycles in my 16" 1:8 twist AR blackout. The lower is a Spikes with military buff tube and the standard buffer and spring. This load is supposed to be subsonic but I haven't chronied it to verify. CCI small rifle primers and a fairly strong lee factory crimp. Brass is converted Rem 223 commercial. OAL is 2.25"

    BB
    I am working up the same components for a friend's 300 Blackout (AR upper). Currently, it is cycling very well with 9.6 grains of H110. However, I wish I could find some 1680 powder for his loads.

  15. #15
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    the real trick on the Blackout to get nearly 100% cycling in heavy subsonic loads is to have a pistol
    length gas system..as most are finding with car gas systems you need a larger than norm gas port in the barrel ..
    also found on J-words that a light crimp gave me much better accuracy.. still expermenting on the cast boolits .. Shot some Lee 180's with 94/4/2 and got good but not great accuracy.. only poured 2 weeks before .. Their approaching a month old now so hope to try them again Monday .. even light crimped a few to see if there was a difference

    just poured 100 lee 230's and powdercoated them last week .. so hope to have some prelim answers next week

  16. #16
    Boolit Bub Coug91's Avatar
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    Quote Originally Posted by Crocks and Socks View Post
    i got mine shooting and cycling great with reloader 7. bullets were cycling at 950 fps. i stopped with 1050 fps with 10.2 grains and bolt locks back on last shot. im using a spikes tactical with wilson combat 16 inch match barrel and carbine length gas system no adjustable block.
    Would this load work with a 10.5" barrel with pistol gas tube? Using the NOE 311247 that drop at 225gr.
    Fortuna Favet Fortibus.

    "Great danger lies in the notion that we can reason with evil." - Doug Patton

  17. #17
    when trying the h110 and lil gun powders the load was tested in 4 different rifles. it would not cycle any of them. two of the rifles had a pistol length gas system as well. all 4 rifles cycled with the reloader 7 and we have all been shooting them since last week with out a problem. out of 200 rounds i have only had one fail to feed and i think it was mag related as well as one fail to hold bolt open on last shot.

  18. #18
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    Quote Originally Posted by Crocks and Socks View Post
    when trying the h110 and lil gun powders the load was tested in 4 different rifles. it would not cycle any of them. two of the rifles had a pistol length gas system as well. all 4 rifles cycled with the reloader 7 and we have all been shooting them since last week with out a problem. out of 200 rounds i have only had one fail to feed and i think it was mag related as well as one fail to hold bolt open on last shot.
    its strange how guns of the same caliber can work so differently .. I have a Novoski 10.5 " and it cycles just fine on Hornady 220 Rn's and 8.5 Grns of Lil Gun.. Very very accurate as well. H110 worked as well ..

  19. #19
    all four of these guns will cycle fine using the lil gun and h110 when using fmj bullets just not the cast bullets

  20. #20
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    getting ready to try the lee 230-5R probably Sunday afternoon.. Poured 100 about 2 weeks ago Pc'ed and sized
    trying 50% lead and 50 % COWW + tin first since I shooting them subsonic.. interested to see if they will shoot straight ( little worried they may bend/tumble in flight) and hopefully expand well.. Figured I would try soft first and then go harder if necessary ..

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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