key hole in the target

Discussion in 'The Ammo & Reloading Forum' started by 358 winchester, Jul 9, 2004.

  1. 358 winchester

    358 winchester *TFF Admin Staff*

    Apr 25, 2004
    Pensacola Fl. area
    Well I have now done something that I have heard about but never paid attention to. I have a load that is key holign at fifty yards. WHY?
    Savage model 24 223 over 20 ga. (turkey gun). I tried some new "ON SALE"
    Olympic ammunntion 5.56 x 45 (223) ss 109 62grs
    this is the only ammo I have ever had to key hole the target.
    would one of you wizards please expline this to me?
    is the bullet to heavy for this gun?
    I do not know what the twist rate is but the 55grs shoot fine and so do the 52grs bullets.
  2. mtnboomer

    mtnboomer New Member

    Jun 13, 2004
    Oklahoma by birth. America by the grace of God.
    I would say that the rifling twist is too fast for the bullet weight. They are being overstablized (spun too fast) and it is causing them to wobble downrange. Stay with 55-gr and lighter. ;)

  3. Crpdeth

    Crpdeth Well-Known Member

    Apr 23, 2002
    Location location

    All I can really tell you, is that I have been researching .223/5.56 ammo recently, and the Olympic SS109's (M193) (red and white box right?) are falling way low on the list...Most of the AR shooters actually prefer Wolf ammo over this stuff.

    Unfortunatly, I personally have several hundred rounds of this crap too, I guess I'll use it when I feel the need to just go blasting.

    Try some Lake City XM193, I bet your problem will go away.

    Last edited: Jul 9, 2004
  4. mtnboomer

    mtnboomer New Member

    Jun 13, 2004
    Oklahoma by birth. America by the grace of God.
    I overlooked the Olympic part of your post. I have heard many bad things about the Olympic .223 on other boards. They may even be out of balance, no one really seems to know. :(
  5. knitepoet

    knitepoet New Member

    Jul 17, 2003
    358, If you check, I'm willing to bet your barrel has a 1:12" twist. The ss109 with it's steel core is longer than even standard 62gr 223 bullets. Most barrels made for the 109 ammo has a 1:9" twist. I used to keep a target I shot with a FNC (that had a 1:12" barrel) I used to own and ss109 ammo. decent group @ 50 and ALL were pretty keyholes.
    edited to add: This chart is the reccomended twist rates for .224 barrels from Shilen's website
    224 CF 8" For bullets heavier than 70 gr.
    9" For bullets up to 70 gr.
    12" For bullets up to 63 gr.
    14" For bullets up to 55 gr.
    15"* For bullets up to 55 gr. driven 4,100 fps or more
    16"* For bullets up to 55 gr. driven 4,300 fps or more
    (also edited for typos)
    Last edited: Jul 11, 2004
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