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  1. #1
    Join Date
    Sep 2011
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    Sparks, NV
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    267

    Default 300 Blackout, Pistol vs Carbine

    Have a 8" Pistol upper for 300 blackout already.
    Is there a advantage / disadvantage to having a Carbine length upper. Would be using the same lower with a SB Tactical SBA-4. Looking at a 16" Ballistic Advantage barreled upper. 98% of my Ammo is Supersonic as well.


    American Veteran and Patriot, Lover of God, Country and Family. No Regrets, No Bullshit


  2. #2
    Join Date
    Jun 2020
    Posts
    193
    300BLK for me is all about the performance you get out of a short barrel. Once you go up to 10" 223 starts to work.

  3. #3
    Join Date
    Jan 2012
    Location
    NW Washington
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    3,080
    Quote Originally Posted by USN-PO2 View Post
    Have a 8" Pistol upper for 300 blackout already.
    Is there a advantage / disadvantage to having a Carbine length upper. Would be using the same lower with a SB Tactical SBA-4. Looking at a 16" Ballistic Advantage barreled upper. 98% of my Ammo is Supersonic as well.
    I currently have a 9" and a 16", and have had some other sizes in the past. There are some small advantages to a 16" carbine, but the 8"-9" range is about 95% as good (and yeah I made up a statistic for the internets, but it more or less conveys the point). All else being equal, for full power supersonic loads there is usually a small ballistic benefit to the longer barrel, on the order of 150-300 fps, and IMO it points a little easier for rapid fire. The longer barrel is slightly quieter as well, suppressed or bare muzzle. That's about all that comes to mind though.

  4. #4
    Join Date
    Apr 2005
    Location
    Exiled in Texas
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    7,599
    If I were using a barrel over 12", I'd rather just have a 5.56. That would give you ammo versatility, too. This last year should have taught everyone a lesson about shortages, and .300 BLK was perhaps the first thing to disappear.
    Virtute et Armis

  5. #5
    Join Date
    Jul 2008
    Posts
    1,794
    Quote Originally Posted by LawDog View Post
    If I were using a barrel over 12", I'd rather just have a 5.56. That would give you ammo versatility, too. This last year should have taught everyone a lesson about shortages, and .300 BLK was perhaps the first thing to disappear.
    You sure it wasn't the 340 Weatherby? Can't find it still. I load my own. If I didn't, I'd have a nice Neanderthal hunting club in a Ruger #1. I guess you don't really have to get rid of the guns, just dry up the supplies of ammo will work nicely.
    I was born for a storm, and a calm does not suit me. - Andrew Jackson

  6. #6
    Join Date
    Feb 2009
    Location
    Colorado
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    8,799
    What Yondering said. My 16 is more quiet that my 8.
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  7. #7
    Join Date
    Jul 2008
    Posts
    1,794
    Do you hunt? The 300 is probably a little better for that.
    I was born for a storm, and a calm does not suit me. - Andrew Jackson

  8. #8
    Join Date
    May 2000
    Location
    Beyond The Wall
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    48,226
    There have been some studies done showing that longer barrels tend to degrade 300 BO accuracy. All of my 300 BO at less than 10".
    Gabriel Suarez

    Turning Lambs into Lions Since 1995

    Suarez International USA Headquarters

  9. #9
    Join Date
    Jan 2012
    Location
    NW Washington
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    3,080
    Quote Originally Posted by Gabriel Suarez View Post
    There have been some studies done showing that longer barrels tend to degrade 300 BO accuracy. All of my 300 BO at less than 10".
    Interesting. That has not been the case with any of mine, although I suppose it could happen.

  10. #10
    Join Date
    Jan 2013
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    The Center of Most of the Fuckery
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    1,253
    The 8.5 inch barrel on mine works better for the role I have given it. I can get good accurate hits out to about 100 (ish) meters with it and it retains good velocity with that barrel length.

    5.56 works better with a longer barrel to take advantage of the powder charge it has.
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