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Thread: 300 Blackout Subsonic Load Recommendation for suppresed - home defense

  1. #21
    Thanks for the info Sensei.

  2. #22
    Quote Originally Posted by El Cid View Post
    OP, maybe you are not understanding the purpose behind the caliber? The subsonic 300BLK was created for situations where being quiet was more important than anything else. It was supposed to replace the MP-5SD and depending on who you talk to, the MP-7. It’s for situations when our military personnel have to get close to something/someone without being detected, but they can switch to a mag full of supersonic ammo for times when rifle performance is needed and everyone already knows you are there.
    I understood the purpose was for better reliability and terminal impact out of a short barrel vs 556 in supersonic and performance better than 9mm sub machine guns in subsonic. See: https://en.wikipedia.org/wiki/.300_AAC_Blackout.

    I guess the question is what the window for a pistol caliber carbine (including a 300 blk sub) in home defense? Is there ever a reason to choose it over a rifle?

    Hornady is selling a 190gr subsonic marketed for home defense https://www.hornady.com/ammunition/r...-x-subsonic#!/

  3. #23
    Member GuanoLoco's Avatar
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    Quote Originally Posted by El Cid View Post
    I guess the question is what the window for a pistol caliber carbine (including a 300 blk sub) in home defense? Is there ever a reason to choose it over a rifle?

    Hornady is selling a 190gr subsonic marketed for home defense https://www.hornady.com/ammunition/r...-x-subsonic#!/
    There are some crazy expansion all-brass subsonics from Lehigh and presumably others but $$$.

    I have fooled aroung with a supressed AR-9 pistol using Fed HST 147 gr for HD. My question is really whether I am not better off with a ‘regular’ pistol that I practice with far more than the AR-9 and which is more handy vs. the AR-9 pistol. Also, I am going to go AR pistol format, why not suppressed 300 AAC supersonic with Barnes TAC-TX, 110gr @ 2300+ fps in an 8-9” barrel with good expansion.
    Are you now, or have you ever been a member of the Doodie Project?

  4. #24
    Quote Originally Posted by underhook View Post

    I understood the purpose was for better reliability and terminal impact out of a short barrel vs 556 in supersonic and performance better than 9mm sub machine guns in subsonic. See: https://en.wikipedia.org/wiki/.300_AAC_Blackout.

    I guess the question is what the window for a pistol caliber carbine (including a 300 blk sub) in home defense? Is there ever a reason to choose it over a rifle?

    Hornady is selling a 190gr subsonic marketed for home defense https://www.hornady.com/ammunition/r...-x-subsonic#!/
    A PCC is better than a handgun because it’s more stable (3 points of contact), usually has an optic, and gives higher velocity. They also usually have higher capacity. But you are using the same ammo that is in your handgun. With 300BLK you can (and should) use supersonic ammo for two legged threats because it’s significantly better regarding terminal ballistics. Choosing subs in 300BLK for personal defense is dumb. If you won’t believe Doc GKR, then I don’t know what else to say.

    And as I mentioned before - Supersonic ammo with a can will be perfectly acceptable just like those of us using 5.56 with a can. You don’t need subs and a can to preserve hearing and communicate during an event.

  5. #25
    @El Cid I'm looking for a solid technical discussion on the pros and cons and make sure we factor in the most recent bullet designs. Doc GKR has outlined an incredibly well thought out and technically sound position which given his background and experience has enormous influence on my personal choice. I'm currently using a BCM SBR 300 BLK with a Surefire suppressor with Barnes supersonics.

    You've raised a great point about the potential that the military use cases that drove the 300 sub development not intersecting with the civilian. I agree that I don't have a use case for shooting and not waking the neighbors from the sound. Your PCC comments are spot on. I’d also add weight. My Sig Rattler is much harder to carry around than my Sig MPX. The POI shift of subs vs supers also means, to me, you cannot run the same optic zero across both super and sub without the cognitive load of two sets of hold overs.

    I'm keen to continue with arguments from both sides on if there is a civilian niche for 300blk subs and let the reader make the choice.
    Last edited by underhook; 01-05-2019 at 11:26 AM.

  6. #26
    Site Supporter Sensei's Avatar
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    Quote Originally Posted by underhook View Post
    I understood the purpose was for better reliability and terminal impact out of a short barrel vs 556 in supersonic and performance better than 9mm sub machine guns in subsonic. See: https://en.wikipedia.org/wiki/.300_AAC_Blackout.

    I guess the question is what the window for a pistol caliber carbine (including a 300 blk sub) in home defense? Is there ever a reason to choose it over a rifle?

    Hornady is selling a 190gr subsonic marketed for home defense https://www.hornady.com/ammunition/r...-x-subsonic#!/
    I noticed that the Hornady video claims the bullet expands down to 900 fps, but the website data claims 1050 fps from a 16” barrel for 12-18” of penetration. That is rather frustrating since most people are using barrel lengths between 8-11” in 300blk. I can’t imagine this fact is lost to Hornady. It makes me think that the velocity from a 9” barrel is right at 900 fps and bullets may struggle to expand beyond just a few feet from the muzzle.
    I like my rifles like my women - short, light, fast, brown, and suppressed.

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