284 win, throat length?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Kroberts, Mar 22, 2015.


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  1. Kroberts

    Kroberts Well-Known Member

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    Sep 17, 2013
    I finally have a barrel on the way for my 284 win build. It's a pac-nor 32" 8 contour with a 5 groove 1-8" twist.The main bullets I want to shoot are the 190 matrix and 195 Berger when it finally gets here. And for a little bit cheaper plinking ammo I will use factory 2nd 180 smk for out to 800 yards and get out the bigger for when I want to play out to 1 mile. I'm hoping to have the 190s be my primary bullet weight so I want the throat more for them but still work with the 180s. I've been having trouble finding anything on a throat length for these extra large pills in a 284. I know the cartridge is a little on the small side for these heavies but the high bc has me interested. What length would you all suggest for a throat length for these? Once I get back from a trip I plan to order some 190 matrix and load up some dummy rounds to get an exact measurement. But that'll probably take a little bit.

    Thanks
    Kyle
     
  2. FearNoWind

    FearNoWind Well-Known Member

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    Will his help?
     

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  3. Kroberts

    Kroberts Well-Known Member

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    If I'm reading it right then the number I'm after is 0.235. Any idea what bullet weight that is for? Or am I just not looking close enough? That does help though, thanks.

    Kyle
     
  4. FearNoWind

    FearNoWind Well-Known Member

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    180 Berger Hybrids work the best for me but there are other factors to consider (e.g. twist rate, etc.) that influence bullet choice so I wouldn't want to specify "best" bullet based on throat length. That said, I'm running a 1:8 on a Bartlein 5R.
     
  5. sable tireur

    sable tireur Well-Known Member

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    Oct 8, 2010
    Kroberts,

    The dimension of a throat in the chamber is usually described by an angle, not length. The length is determined by that angle since it cannot be larger in diameter than the leade or freebore.

    Length for seating is usually described by the leade or freebore which is a cylinder. The number you acknowledge as 0.235" in this example shown is correct for the leade length, not throat but that is the number you're looking for as long as you know the proper angle of the throat.

    Regards.