1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

7,62x54R, 303 British, 30-06...nominal measurements for Bore, Bullet and Grooves.

Discussion in 'Rifle Country' started by saturno_v, Nov 6, 2009.

  1. saturno_v

    saturno_v Well-Known Member

    According to the http://www.7.62x54r.net website, the nominal bore diameter of a Russian Mosin Nagant is 0.300" (some can go as high as 0.303), nominal Groove diameter is 0.311" (but they tend to be larger, up to 0.314") and nominal bullet diameter is 0.311"

    What are the 3 nominal measurements (Bore, Groove and Bullet) for a 303 British?? Bore should be 303, as the very name says right?

    What about the nominal bore and groove diameter for a 30-06 barrel?? (bullet as we all know is 0.308"), bore should be 0.300"...correct?

    Who has a nominal bullet diameter of 0.312?

    If the nominal bore diameter of a Mosin Nagant and a 30-06 is the same (0.300") can we say that the difference is that the Mosin has "deeper" grooves?

  2. Jim Watson

    Jim Watson Well-Known Member

    .303 British bore is .303", groove is .313", I don't know the official bullet diameter. Tolerances usually plus, although there are recorded cases of barrels enough undersize to shoot well with .308" bullets.

    A .312" bullet is about right for the 7.65 Belgian/Argentine/Turk.

    The other main oversize .30 is 7.7 Japanese, which some consider a rimless .303 derivative.
  3. rcmodel

    rcmodel Member in memoriam

    According to Hatcher's Notebook:

    30-06 = .300" bore - .3086" bullet. (original military bullet spec)
    7.62x54R = .300" bore - .310" bullet.
    .303 British = .303" bore - .312" bullet.

    Yes, it would appear the 7.62x54R has deeper grooves.

  4. DougW

    DougW Well-Known Member

    .303 bullets are .311

Share This Page