Russian SKS a .308 or .310 bore???

Discussion in 'Technical Questions & Information' started by GW1, Jun 26, 2010.

  1. GW1

    GW1 New Member

    Joined:
    Jun 29, 2009
    Messages:
    39
    hello,

    I have a Russian SKS 7.62x39 rifle and I want to reload for it and I have tried my calipers and cannot consistently come up with the size of the bore. I get .308 and .309. once in a while if I press hard enough, I will get a .310. Does anyone know for sure if it is okay if I load .308 and or .310 bullets to shoot out of it? I know the .308 bullets, if too small, will not be as tight and may reduce some of the velocities, but i can work with that. Any help would be greatly appreciated. Thank you and happy loading.

    Jon--
  2. LDBennett

    LDBennett Well-Known Member

    Joined:
    Dec 20, 2003
    Messages:
    6,883
    Location:
    Hesperia, CA
    GW1:

    7.62 x 39 bullets for an SKS requires .310 bullets. If you use .308 bullets not only will the velocity suffer but so will the accuracy. Use the right bullets (.310).

    But if it was a Ruger Mini-14/30 in 7.62 x 39 that you had (I know you have a Russian SKS) then the correct bullet are .308. Why Ruger chose that path is beyond me (??).

    As an aside, the way you determine the bore size of a barrel is to force a soft slug of lead through the barrel with a cleaning rod and measure the slug with accurate micrometers. That's called "Slugging the barrel".You will never get any meaningful bore dimensions using calipers in the bore due to the rifling lands and grooves. It is the dimension between the bottom of the grooves that is the dimension used to fit bullets to the gun.

    I would also add that the above info on the 7.62 x 39 appears in the Hornady Reloading Manual. If you are reloading without the aid of a manual then you are stepping onto shaky ground. Get a manual and read it several times until you thoroughly understand the processes. The Hornady manual is as good as any and includes detailed descriptions and pictures of how cartridges work in a gun and how the reloading processes work to make good ammo.

    LDBennett
    Last edited: Jun 27, 2010
  3. carver

    carver Moderator

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    +1 What LDBennett says.
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