Sources for Subsonic Load Data

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    Silverlax

    Silverlax

    Active Member
    Nov 13, 2014
    518
    Eastern Shore
    Been bitten by the subsonic bug recently and have been on the search for any resources that might help. Any info/articles on safely developing a sub load that does not have published data would be great too. Looking for 308, 6.5 creedmoor, 223, 300 blk. I know some of these aren’t practical in sub loads but I just thought it would be cool to try. Any help is appreciated.
     
    M

    Major03

    Ultimate Member
    Jan 23, 2013
    1,779
    Northern Maryland, Baltimore County
    http://forum.snipershide.com/forums/sniper-s-hide-reloading-depot/

    This is just a link to a general sub forum at the hide. I'm pretty sure I remember seeing info on sub .308 in there (and probably 6.5 and .223) You might have to dig a bit, but my experience is that the folks over at the hide that post are general professionals or at least are amateurs with a HELL of a lot of experience.

    http://www.300blktalk.com/forum/viewforum.php?f=141&sid=483053fc504dd176fe35ffb907d98968

    All things 300 BLK. Wealth of knowledge here if you're new to the cartridge.
     
    Jmorrismetal

    Jmorrismetal

    Active Member
    Sep 27, 2014
    468
    For subsonic .223’s I just get a 22 LR and call it done.

    In 308 trailboss is the powder and 11 grains with my cast and coated 150 grain bullets make for good backyard plinkers.

    Lots of different loads for the 300 blk, just look for heavy bullet load data.

    Never tried a subsonic 6.5 Creedmoor, sounds like trying to make a laserbeam not put out any light.

    One thing to note when going slow is instead of working up your load, you work down the load. Better to start high than stick a bullet in the bore.

    https://imrpowder.com/wp-content/uploads/2016/11/trail-boss-reduced-loads-r_p.pdf
     
    Silverlax

    Silverlax

    Active Member
    Nov 13, 2014
    518
    Eastern Shore
    Thank you all, the info was very helpful.

    Jmorrismetal said:
    For subsonic .223’s I just get a 22 LR and call it done.

    Never tried a subsonic 6.5 Creedmoor, sounds like trying to make a laserbeam not put out any light.
    Click to expand...

    I had been told that but I thought it would be interesting to have more versatility within a single platform/caliber by going subsonic.
    I actually took the creedmoor out the other day and tested supersonics through the can. It was impressively quiet. It did only take about 4 rds to get the can too hot to touch.
     
    D

    deerassassin22

    Active Member
    Apr 12, 2016
    701
    Littlestown, PA
    The First String was only 5rnds I was unable to get setup in time. I also was unable to reset between strings to the get the SD and ES numbers as well. This is without the suppressor, no keyholing at 100yards the 10.6 and 10.3 grouped the best all within 1.5 inches for me.

    Gun: DPMS GII Recon 16inch Factory Barrel
    Hornady Brass TTL. 2.005
    Flash Hole Resized
    Pockets Uniformed
    FL Resized and Neck Resized to: .332
    COAL 2.790
    178grn Hornady ELX Match
    CCI Large Rifle Primer
    Measure 10ft From Barrel to Chrono

    Temp: 83
    1022.5 Baro Pressure
    27.4 Wet Bulb
    26.9 DP
    88.5 Rel Humidity
    -245ft Altitude

    10.6grain Trail Boss

    1077
    1028
    1059
    1034
    1071
    Avg Velocity: 1053

    10.3grn Trail Boss
    1077
    1025
    1059
    1034
    1071
    Avg: 1053

    1052
    1049
    1068
    1055
    1054
    Avg: 1055

    10.0grain Trail Boss
    1025
    1026
    1040
    993
    1017
    Avg: 1020

    1012
    1012
    1028
    1014
    1028
    Avg: 1018

    9.7grains Trail Boss
    983
    990
    998
    981
    992
    Avg: 988

    991
    996
    978
    986
    1007
    Avg: 991
     
    P

    PoPo3

    Active Member
    Oct 26, 2009
    364
    Hagerstown, MD
    I don’t know if you found a sub load for your blackout, but the CFE black powder ended up being phenomenal for me. I tried a bunch of different powders and this one was the most consistent. My load was 11.5 grains with a 190 SMK. 2.250”. Sub moa out of a bolt gun.
     
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