Graf & SonsLee PrecisionRotoMetals2MidSouth Shooters Supply
ADvertise hereTitan ReloadingStainLess Steel MediaInline Fabrication

Results 1 to 10 of 10

Thread: Ruger 7.62 x39mm Ranch Rifle .308 or .310 bore?

  1. #1
    Boolit Master
    Shooter6br's Avatar
    Join Date
    Oct 2007
    Location
    Warminster Pa. ( North of Filthydelphia)
    Posts
    1,794

    Ruger 7.62 x39mm Ranch Rifle .308 or .310 bore?

    Probably addressed before. I assume the bore is .310? i shoot cast in SKS with .312 Lee TL 160 grain. Twist is 1 to 10 in Ruger and SKS, Thanks ( May be trading time soon)

  2. #2
    Boolit Master


    Larry Gibson's Avatar
    Join Date
    Jul 2005
    Location
    Lake Havasu City, Arizona
    Posts
    15,542
    Early ones had .308 groove diameter
    Larry Gibson

    “Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
    ― Nikola Tesla

  3. #3
    Boolit Master map55b's Avatar
    Join Date
    Oct 2013
    Location
    Santa Clara, CA
    Posts
    152
    I believe it is a .308, but can not sate for sure. I have a rifle I built in 7.62x39 with a .308 bore and it works just fine. I know the reamer I have from PTG has a long lead to accommodate for this and shoot anything from ~.312 to .308 without issue.

  4. #4
    Boolit Master

    Join Date
    Jun 2009
    Location
    North central Ohio
    Posts
    681
    I have a recent vintage, .310 bore.


    We accumulate our opinions at an age when our understanding is at its weakest. Georg C. Lichtenberg

    At what point, then, is the approach of danger to be expected? I answer, If it ever reach us it must spring up amongst us; it cannot come from abroad. If destruction be our lot we must ourselves be its author and finisher. As a nation of freemen we must live through all time, or die by suicide. A. Lincoln

  5. #5
    Boolit Master gnostic's Avatar
    Join Date
    Jan 2014
    Location
    Somewhere over the rainbow...
    Posts
    217
    I have a 189 series that shoots .312 cast bullets perfectly...

  6. #6
    Boolit Master Outpost75's Avatar
    Join Date
    May 2013
    Location
    over the hill, out in the woods and far away
    Posts
    4,818
    Early production Mini Thirtys used moderately oversized .30 cal. barrels which didn't gage up for regular production, in which groove diameter exceeded .3085". Later on I don't know. I do know that during the development and test stage they had pressure barrels made to both Lake City and CIP prints with both .308 and .310 groove diameters and shot all of the common ammunition available at that time. I provided some Vietnam-era Lake City, Chinese, and Russian ammo for them at the time, and they also shot Sako, Norma, Lapua and PPU.

    While the .308 groove diameter raised pressure somewhat there was a greater difference between the Lake City (back-engineered from Chinese) and CIP chamber (similar to Finnish military, Lapua, Norma and Sako commercial), than there was between barrel groove diameters. The SAAMI chamber eventually adopted was based on the CIP chamber, with minor changes to reflect US dimension and tolerancing conventions, which gives pressures well within the Mini-14 design limits with all common Type PS and lead core ball ammo.

    The Lake City and Chinese chambers provide less base support to the bullet than the CIP or SAAMI type chambers, and tended to raise pressure with flat-based, lead-core ammunition. While this was not an issue with GMCS mild steel-core PS ammunition in the LC or Chinese chamber, Ruger and SAAMI very wisely opted to base the chamber configuration adopted by SAAMI on the commercial version already in sporting use in the EU and adopted by CIP.
    Last edited by Outpost75; 09-01-2017 at 08:13 PM.
    The ENEMY is listening.
    HE wants to know what YOU know.
    Keep it to yourself.

  7. #7
    Boolit Master


    Join Date
    Apr 2005
    Location
    Eastern South Dakota
    Posts
    3,395
    Notwithstanding all those excellent replies above, if you want to know any given bore size, regardless of what any manufacturer says, you must measure it yourself. This applies to any rifled firearm.


    Cat
    Cogito, ergo armatum sum.

    (I think, therefore I'm armed.)

  8. #8
    Boolit Master marlin39a's Avatar
    Join Date
    Apr 2010
    Location
    Paulden, Arizona
    Posts
    684
    I have a new production mini 30 tactical. .310 bore. Ruger just announced the American Ranch in 7.62x39. .310 as well.

  9. #9
    Boolit Master

    Join Date
    Jun 2009
    Location
    North central Ohio
    Posts
    681
    Ruger just announced the American Ranch in 7.62x39. .310 as well.[/QUOTE]

    Swell, just when I make up my mind I didn't need anymore rifles.


    We accumulate our opinions at an age when our understanding is at its weakest. Georg C. Lichtenberg

    At what point, then, is the approach of danger to be expected? I answer, If it ever reach us it must spring up amongst us; it cannot come from abroad. If destruction be our lot we must ourselves be its author and finisher. As a nation of freemen we must live through all time, or die by suicide. A. Lincoln

  10. #10
    Boolit Master marlin39a's Avatar
    Join Date
    Apr 2010
    Location
    Paulden, Arizona
    Posts
    684
    Quote Originally Posted by Jeff Michel View Post
    Ruger just announced the American Ranch in 7.62x39. .310 as well.
    Swell, just when I make up my mind I didn't need anymore rifles.[/QUOTE]

    And it will take mini 30 magazines.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check