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Thread: Loads for AR pistol

  1. #1
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    Loads for AR pistol

    Just ordered one today with 1:7 twist 11.5 barrel. Are you guys using 77 or 62 Grs for sd rounds? And what bullet are you using?


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  2. #2
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    Ive been using 55gr federal bonded LE rounds but would love to try a few MK262 77gr


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  3. #3
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    Federal bonded LE loads (both the FBI and I prefer 62gr), any load with Barnes TSX (again, I prefer 62gr), Hornady 75gr SBR, MK262 Mod1 or clone...

    Selection Process
    1- Buy some of each of the above, and any others you wish to try, and see which one your gun likes.

    2- Buy a stock of that load.

    3- Buy lots of practice loads so you can put your selected load where it needs to go.

    Number 3 is the most important.

  4. #4
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    I guess I wasnt super clear. I roll my own. So am a little limited in the department as far as some selection on bullets.


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  5. #5
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    77 gr OTMs or 77 gr TMK. Both fragment well in short guns. I like XBR or H322 pushed a little over max based on your own work up.
    "You people have too much time on your hands." - scottryan

  6. #6
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    Quote Originally Posted by markm View Post
    77 gr OTMs or 77 gr TMK. Both fragment well in short guns. I like XBR or H322 pushed a little over max based on your own work up.
    Thanks. I have 1000 75gr hpbt to load and a bunch of 77smk loaded up for my ar. Maybe Ill get lucky and the pistol will shoot that the current loading of smk decent enough. Are you looking for a specific muzzle velocity, what are you looking for when building rounds for an ar pistol?


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  7. #7
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    Quote Originally Posted by ubet View Post
    what are you looking for when building rounds for an ar pistol?
    We don't have any AR Pistols specifically, but SBRs down to 10.3. I really just build the load off of a 20" bolt gun so my velocity comparisons are apples to apples. If it's a stout load on the 20", it should be fine on the shorties since we don't run slow burn powders for any AR ammo.
    "You people have too much time on your hands." - scottryan

  8. #8
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    Quote Originally Posted by ubet View Post
    Just ordered one today with 1:7 twist 11.5 barrel. Are you guys using 77 or 62 Grs for sd rounds? And what bullet are you using?


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    I'm using a Mk262 Mod 1 clone round (77gr) in my 10.5" 1/7 pistol build that's styled after a Mk18 Mod 0. The SmallArmsSolutions ammo test has some terminal ballistic comparisons of this round from barrel lengths of 10.5"" through 20" and performance is impressive across the board. I load mine with 77gr SMKs or Noslers, over 23.8 or 24.0gr of 8208 XBR, LC brass and Rem 7-1/2 primers. MV averages around 2,780fps at 23.8gr with SDs around 10 and 3/4-MOA groups from my Mk12 Mod 1 (18" barrel). Accuracy is a little better at 24.0gr, but it's hot! I haven't checked velocity through the 10.5" pistol, but it should equal or exceed the Black Hills round - YMMV.

    I'm also considering solids for better penetration, primarily the 62gr Barnes TSX, but can't find any in stock. I have some 70gr GMX solids to tinker with, but it will be hard to beat the 77gr for accuracy and open area SD.

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