Quantcast
  1. Sign up now and join over 35,000 northwest gun owners. It's quick, easy, and 100% free!

Unstable bullets in 300 blackout

Discussion in 'Ammunition & Reloading' started by 45 for me, Jul 16, 2016.

  1. 45 for me

    45 for me Oregon Well-Known Member

    Messages:
    301
    Likes Received:
    268
    I have a Liberty Leonidas 300bk upper. It's an 8 1/2" Lilja barrel with a large integral suppressor. 1/8 twist

    LEO-A-short.jpg
    I am shooting Missouri bullet companies lead, polymer coated, 245gr bullets

    28136.jpg
    I have shot several hundred of these so far with no issues, but I noticed after doing a rapid fire on an already warm firearm, some of the bullet strikes were horizontal at 20yds. That wasn't happening during slow fire, and I have shot accurately with these loads at 100yds.

    The load is 12gr with accurate 1680. These are right at the 1000-1050fps range.

    Thoughts?
     
  2. Twodogs

    Twodogs portland Or Active Member

    Messages:
    650
    Likes Received:
    173
    I would drop down to a 200-208 gr bullet or try leatherhead 245's they are sized to .311 and are said to do better then the Missouri bullets at .309.
    I'm shooting a 1-7" and have better luck with 180-200 gr bullets.
     
    45 for me likes this.
  3. 45 for me

    45 for me Oregon Well-Known Member

    Messages:
    301
    Likes Received:
    268
    I am going to check the barrel for lead fouling too. Do you think hot barrel & lead bullet combo could cause this? The weird thing is they seemed to be stable with slow fire.

    Thanks for the tip on Leatherhead.
     
    Dyjital likes this.
  4. Twodogs

    Twodogs portland Or Active Member

    Messages:
    650
    Likes Received:
    173
    Wouldn't hurt to give the barrel a real good cleaning and shoot some slow 3 shot groups.
     
  5. Camelfilter

    Camelfilter Salem Bronze Supporter Bronze Supporter

    Messages:
    958
    Likes Received:
    1,588
    ?Polymer melting/melting too soon under rapid?
     
  6. PaulB47

    PaulB47 Hillsboro Well-Known Member

    Messages:
    1,857
    Likes Received:
    2,599
    Verify your velocity after getting things heated up? Should be the same but who knows...

    I agree too with looking at a larger diameter. Maybe harder too?