Page 1 of 6 123 ... LastLast
Results 1 to 10 of 55

Thread: New 6.8 mm and .300 BLK tests

  1. #1
    Site Supporter DocGKR's Avatar
    Join Date
    Feb 2011
    Location
    Palo Alto, CA

    New 6.8 mm and .300 BLK tests

    We recently tested some newer supersonic loadings in 6.8 mm and .300 BLK.



    6.8 mm Federal 90 gr Gold Dot JSP at 2604 f/s
    BG: Pen=12.3", RD=0.62", RL=0.26", RW=83.6gr
    AG: Pen=13.0", RD= 0.54", RL=0.22", RW=75.0gr

    Shot into BG above one through AG

    6.8 mm SSA 85 gr TSX OTM at 3024 f/s
    BG: Pen=18.5", RD=0.56", RL=0.41", RW=85.3gr
    AG: Pen=17.0", RD= 0.58", RL=0.39", RW=65.4gr

    Shot into BG depicted; AG wound profile not shown, but nearly identical

    6.8 mm SSA 100 gr Accubond PT at 2680 f/s
    BG: Pen=16.0", RD=0.48", RL=0.47", RW=83.5gr
    AG: Pen=18.5", RD= 0.48", RL=0.41", RW=78.1gr

    Shot into BG above one through AG

    .300 BLK Rem 110 gr TTSX at 2250 f/s
    BG: Pen=20+", RD=0.54", RL=0.50", RW=107.6gr
    AG: Pen=17.0", RD= 0.58", RL=0.22", RW=65.4gr

    Shot into BG above one through AG

    .300 BLK Rem 125 gr SMK OTM at 2236 f/s
    BG: Pen=20+", projectile not recovered

    bilobed yaw cycle with curvature and no hyper-expansion/fragmentation, very much like the 5.45x39mm M74/5N7 FMJ

    .300 BLK Rem UMC 115 gr FMJ/CTFB at 2242 f/s
    BG: Pen=20+", RD=0.30", RL=1.14", RW=112.6gr

    very long, broad single cycle yaw cycle with curvature and no hyper-expansion/fragmentation

    Interestingly, the .300 BLK Rem UMC 115 gr FMJ/CTFB offers the longest single yaw cycle that we have ever seen.

    Both 6.8 mm and .300 BLK are excellent cartridge choices for individuals and organizations requiring a caliber larger than .223, that functions reliably in an AR15. At this time, the major .300 BLK loadings all penetrate deeper than the 12-18" ideal range for LE use; in contrast there are multiple 6.8 mm loads which currently meet this criteria, along with offering acceptable intermediate barrier capability.


    Top row: .300 BLK Rem 110 gr TTSX; below the dime are the 6.8mm SSA 85 gr TSX, Federal 90 gr GD JSP, and SSA 100 gr Accubond PT. Right column in BG, left column through automobile windshields.

    While the .300 BLK TTSX is a superb loading for military and hunting purposes, penetration is a bit deeper than ideal for LE use. An LE optimized .300 BLK loading engineered with proper feed profile, 12-18" penetration depth, that is blind to barriers will be a great addition.

    .300 BLK Rem 110 gr TTSX vs. .300 BLK Rem UMC 115 gr FMJ/CTFB in BG
    Last edited by DocGKR; 03-10-2013 at 08:08 PM.

  2. #2
    Member
    Join Date
    Dec 2011
    Location
    Bellingham WA
    Great information. Thanks again for keeping us up to date on ammo advances.

    Cheers to a great weekend for all.
    Semper Paratus,

    Steve

  3. #3
    Site Supporter Odin Bravo One's Avatar
    Join Date
    Feb 2011
    Location
    In the back of beyond
    Doc,

    any plans on looking into the various SubSonic offerings? Specifically the big, slow, heavy 200's or 220's?

    Thanks for sharing......as always, your expertise is an invaluable resource for the board, and shooting community in general.

  4. #4
    Site Supporter DocGKR's Avatar
    Join Date
    Feb 2011
    Location
    Palo Alto, CA
    The current subsonics using the heavy SMK's just go in, yaw 180 deg, then exit base forward. Nothing very exciting--penetration is very deep; definitely not appropriate for LE use. Once some of the proposed expanding subsonic projectiles reach fruition, then we will appropriately test them.

  5. #5
    Site Supporter Odin Bravo One's Avatar
    Join Date
    Feb 2011
    Location
    In the back of beyond
    Thanks Doc.

    Looking forward to your findings. Not that the coyotes care........but I find it useful.

  6. #6
    Since 5.45 was mentioned, any plans of ever testing the Hornady VMax 5.45?
    #RESIST

  7. #7
    Site Supporter Jay Cunningham's Avatar
    Join Date
    Feb 2011
    Location
    Pittsburgh, PA
    Quote Originally Posted by LittleLebowski View Post
    Since 5.45 was mentioned, any plans of ever testing the Hornady VMax 5.45?
    I would find this interdasting.

  8. #8
    Site Supporter DocGKR's Avatar
    Join Date
    Feb 2011
    Location
    Palo Alto, CA
    We have a box to test that was graciously donated. The problem has been finding time to do so, since no agencies use this caliber. I suspect it will act like any other .223/5.56 mm projectile of similar weight and construction--for example the .223 Hornady 55 gr TAP.

  9. #9
    Very Pro Dentist Chuck Haggard's Avatar
    Join Date
    Feb 2011
    Location
    Down the road from Quantrill's big raid.
    Quote Originally Posted by DocGKR View Post
    We have a box to test that was graciously donated. The problem has been finding time to do so, since no agencies use this caliber. I suspect it will act like any other .223/5.56 mm projectile of similar weight and construction--for example the .223 Hornady 55 gr TAP.
    While it wasn't a calibrated gel test, I found that the Hornady .223 and 5.45 TAP bullets acted the same in water filled milk jugs, in both fragmentation and penetration.

  10. #10
    DocGKR,

    In regards to the 300 Blackout results, looks like the Rem 115gr and the Rem 125gr SMK did much more tissue damage than the Barnes TTSX. Seem counter to my understanding of those rounds ...

    Or am I missing something?

    -Bryan

User Tag List

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •