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)
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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)
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
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.
I have a recent vintage, .310 bore.
“Let us endeavor so to live that when we come to die even the undertaker will be sorry.”
― Mark Twain
W8SOB
I have a 189 series that shoots .312 cast bullets perfectly...
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.
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.)
I have a new production mini 30 tactical. .310 bore. Ruger just announced the American Ranch in 7.62x39. .310 as well.
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.
“Let us endeavor so to live that when we come to die even the undertaker will be sorry.”
― Mark Twain
W8SOB
Swell, just when I make up my mind I didn't need anymore rifles.[/QUOTE]Originally Posted by Jeff Michel
And it will take mini 30 magazines.
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