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Thread: 300 Blackout Load Data

  1. #21
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    Quote Originally Posted by rsilvers View Post
    That may be a little warm. 2250 fps is probably where I would stop. depending on your powder and OAL. The factory 125 grain ammo is about 2220 fps.
    Yes it is a little hot but I am loading them a little long as well. I am loading 20.5 grains H110 in LC Brass at 2.05 OAL (Not recommended always work your way up) 2307fps average hot yes but should be a good round for deer but I need to check expansion at 100 yards.

    Ed

  2. #22
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    300aacblackout.com has gel tests of that. Just figure out at what range you will have the same velocity.

  3. #23
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    http://www.300aacblackout.com/resour...t06OCT2010.pdf

    The gel test was at 2095 fps. So if you start at 2300 fps, then you will reach 2095 fps at 70 yards.






  4. #24
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    Quote Originally Posted by rsilvers View Post
    I think A1680 is the best powder for subsonic from an AR if the primary goal is reliable function. RE-7 can work also but the charges are rather compressed.
    Lil'Gun has worked pretty well for me in both super and subsonic roles.

    I have RE7 and IMR4198, but haven't bothered with them.

    How much chamber pressure you figure is required to cycle the action?

  5. #25
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    About 25,000 psi - but only with slower powder like RE7, H4198, or A1680. If you make 25,000 psi with Bullseye pistol powder, it won't cycle.

  6. #26
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    Any opinion on handgun powders? I initially saw someone post that a .45 ACP load for 230g FMJ would be about subsonic.

    Never tried it, maybe I oughta. You figure it won't cycle?

  7. #27
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    45 Auto has a different bore dimension and case capacity so it is not comparable.

    You want a burning rate and bulk density around RE7, A1680, or H4198.

    http://www.reloadbench.com/burn.html

  8. #28
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    Todd.K
    I beg to difer with you. My Speer Hotcor 150 gr BT opened up very nicely all the way out to 200 yards. All the bullets I found were very nice mushrooms. So out to 200 yards they should work very well on pigs and deer. If you need more distance then the 130 gr Speer HP's should do well out to 250 yards.

  9. #29
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    I was out test firing an AR yesterday afternoon at the public range. There was some cat shooting a non-NFA 300blk with a loud brake.

    This guy was a strange BLK boy. He left his brass there... which I took for a member here who's shooting this caliber....

    But when I asked him about going shorty, silenced, sub sonic, etc.... He was like... "that's too much paper work".

    Struck me that he's missing any upside to the round by just shooting a full sized gun. AND not loading the round or saving his brass.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  10. #30
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    300 BLK is simply a 30 caliber AR15. So when I hear that, it sounds like anyone shooting a 30-30 or 7.62z39mm needs to have a short barrel and a suppressor.

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