X 39 Fireformed Brass vs True Grendel Brass vs Pressure

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  • X 39 Fireformed Brass vs True Grendel Brass vs Pressure

    Just some more QL data. This time QL compares my AA Grendel brass @36gr of H20 and my X39 IMI fireformed brass @33.6gr of H20.

    100gr Nosler BT
    28gr H-322
    18 inch barrel
    AA Brass=51,390psi=2673fps
    IMI X39 Brass= 61,171psi=2779fps

    Be careful if you guys are using x39 brass, it's best to measure the case capacity and adjust your loads accordingly.
  • txgunner00
    Chieftain
    • Mar 2011
    • 2070

    #2
    What does it say about my loads?

    100 NBT
    fireformed IMI 7.62x39
    IMR 8208
    29 grains= case full to bottom of neck

    I get 2819 FPS with this load and no signs of overpressure.
    NRA life, GOA life, SAF, and TSRA

    "I ask, Sir, what is the militia? It is the whole people, except for a few public officials. To disarm the people is the best and most effectual way to enslave them."

    George Mason, co-author, 2nd Amendment.

    Comment


    • #3
      Originally posted by txgunner00 View Post
      What does it say about my loads?

      100 NBT
      fireformed IMI 7.62x39
      IMR 8208
      29 grains= case full to bottom of neck

      I get 2819 FPS with this load and no signs of overpressure.
      QL does not list 8208. I'm guessing it along with many of the other new powders will be listed in the next version update.

      Comment

      • RangerRick

        #4
        I don't know if that holds true in the real world. I used fire formed IMI brass and Lapua with the same AA 2520 30 grain load and there was only about 25 fps difference.

        RR

        Comment

        • pinzgauer
          Warrior
          • Mar 2011
          • 440

          #5
          From memory someone did some fairly extensive testing and found that though the IMI needed less powder for same pressure due to reduced capacity, it was very close in velocity. Maybe LR1995??

          Comment

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