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Ruger 77 in 7.62x39 ?
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Kabluewy
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posted
Is the Ruger 77 MKII chambered in 7.62x39 a .308 groove or is it .311? I get a bit confused when talking about groove and bore diameter, but I think it's the groove diameter that determines the bullet diameter. I think I remember the Ruger is for .308 bullets.

Thanks for info.
KB


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Posts: 12818 | Registered: 16 February 2006Reply With Quote
Sambar 9.3
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If it's the same as the ones shipped to OZ, then it's a 308...


Cheers, Dave.

Aut Inveniam Viam aut Faciam.
 
Posts: 6716 | Location: The Hunting State. | Registered: 08 March 2005Reply With Quote
Krochus
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The short answer is IT DEPENDS you need to slug your bore

http://thehighroad.org/showthread.php?t=178431

read post number 16 as it pertains to your rifle

posted on 10-16-06 by BruceB

quote:
I'm a long-time, devoted, cast-bullet nut of the worst sort, and internal barrel dimensions can be critical in the cast-bullet game.

Therefore, when I obtained my stainless Ruger Model 77 bolt-action in 7.62x39, one of the priorities was to find out what the bore dimensions REALLY are. As mentioned earlier, the lead slug doesn't lie.

Are you ready? This 7.62x39 M77 Ruger bore has a groove diameter of .3105", definitely NOT a standard .308" barrel. It was slugged three times to be absolutely sure of the result.

It has now digested well over 150 separate and distinct cast-bullet recipes, ten rounds per combination,with bullets from 130 to 220 grains, all sized at .312". Powders ranged from Unique to IMR 4350, and decent results were obtained with quite a few of my loads.


----------------------------------------

If you waste your time a talkin' to the people who don't listen
To the things that you are sayin' who do you thinks gonna hear
And if you should die explainin' how the thing they complain about
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Waylon Jennings
 
Posts: 329 | Location: NW Arkansas | Registered: 19 February 2006Reply With Quote
Con
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I have an original test report from an Australian magazine ... I'll check it out, but remember twist was given as a fast 1:10".
Cheers...
Con
 
Posts: 2198 | Location: Australia | Registered: 24 August 2001Reply With Quote
Leftoverdj
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The early Ruger Mini-30s had .308 bores. That did not last long, but the rumors have.


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Posts: 1570 | Location: Base of the Blue Ridge | Registered: 04 November 2002Reply With Quote
Con
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Not much help, but the test report on the 7.62x39 cartridge using a Ruger MkII stainless/synthetic stated that fired cases from the Ruger MkII would not accept a 0.310" projectile but would allow a 0.308" projectile to slip into the case. There is also reference to the Ruger's "tight-bore" suggesting its 0.308".

Hazy memory tells me that Clymer produced and had available a hybrid reamer than allowed 0.311" projectiles to be used in 0.308" bores and that Ruger may have used that chambering? Tested with ex-mil ammunition the Ruger MKII did fine, less successful where the Mini-14's where extractor damage was noted with some brands of ex-mil. The term "rubber micrometer" is used to describe manufactured 7.62x39 ammunition and its variations.
Cheers...
Con
 
Posts: 2198 | Location: Australia | Registered: 24 August 2001Reply With Quote
Sambar 9.3
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quote:
Originally posted by Leftoverdj:
The early Ruger Mini-30s had .308 bores. That did not last long, but the rumors have.


That must have been the variant I had...
Made (IIRC) around '96?


Cheers, Dave.

Aut Inveniam Viam aut Faciam.
 
Posts: 6716 | Location: The Hunting State. | Registered: 08 March 2005Reply With Quote
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