80gr. Sierra MK for .224

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Exhaust3, Jan 21, 2004.

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  1. Exhaust3

    Exhaust3 Well-Known Member

    Dec 2, 2003
    I was wondering does anyone have load information, specifically powder charges and muzzle velocity, for a .223 using the 80gr. SMK? I have a Howa chambered for .223 but it's at my 'smiths getting a new tube and a rechamber to .223 AI. [​IMG]
  2. Guest

    Guest Guest

    would look in your sierra manual would be in there.... couldnt tell you any off hand, will take a look if i can find it.
  3. milanuk

    milanuk Well-Known Member

    Jan 21, 2002
    There is a butt-load of data out there for the .223 w/ 80gr bullets, mostly for AR's though. The trick is piecing together the data in a useful fashion, i.e. what case were they using, what primer, what powder, how much, what velocity, moly or naked, OAL, etc. And then half of the data (or more) doesn't include chrono data.

    Search the forums at:
    Florida HighPower
    AR-15.com Competitive Shooting & the Accurate AR
    AR-15.com Reloading

    Also, there is some good info at:

    from a prominent AR gunsmith.

    The new Sierra loading manual splits up the loading data btwn gas guns and bolt guns, since the bolt guns are a little less sensitive to pressures.

    Lots of data out there, but it'll take a fair amount of work to sift thru it all. And if you are using an AI (from the sounds of it), well, you'll be largely on your own [​IMG] Enjoy!


    [ 01-21-2004: Message edited by: milanuk ]

    [ 01-21-2004: Message edited by: milanuk ]
  4. Varmint

    Varmint Well-Known Member

    Jan 26, 2008
    you didn't say what twist you have,so I will tell you that you need a 1/8 or a 1/9 twist to shoot the 70 to 80 gr bullets. I shoot out of my AR 15 80 gr. SMK with Varget 24 grs. You can use varget,vihtavouri N140,AA-2520,reloader 15,win 748,and BLC2 to name some.