02-03-2008, 02:21 PM
| #1 |
| Senior Member Join Date: Sep 2007 Location: Northeast Kansas
Posts: 127
| 7.62x39 experiment Seldom poster regular reader here needing some help. 7.62x39 sks bores are for the most part .311"dia. and the ruger mini 30 has a .308 bore. Imported bulk/surplus/cheap ammo is .311 dia and the ruger shoots it safely. Now to my question. In my CZ 527 which I believe to have a .311 bore, can I use a .312 dia bullet? I am looking at hornady's xtp 100gr pistol bullet. This is where things get complicated. I don't know how much aa1680 to push it with. My hornady manual shows a 123gr .310 sp at a max load with 23.9 grains, Speer shows a .311 125 gr at 28 grains. Hornady's test rifle is an SKS(.311 bore), Speer is a ruger bolt (.308 bore?). Another thing is the xtp is a pistol hp so do i have to worry about too low pressure, causing the bullet to get stuck when it gets to the lands? What kind of powder charge would be a good minimum for a standard rifle bullet? Would that be the same for another bullet type? I realize a certain amount of sanity (how much I'm not sure, my girlfriend thinks more than a little  ) isn't being used here but what the hell, we wouldn't learn anything if we didnt experiment. Any feedback, related stories, voices of reason welcome |
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02-03-2008, 04:55 PM
| #2 |
| Senior Member  Join Date: Oct 2006 Location: Edmonds, WA
Posts: 3,522
| Since you're not exactly sure what size of bore your CZ has, you should slug the bore so that you're aware what kind of variance you could be dealing with. It could be that it's actually .308" and a .312" bullet would be tight; or, it could be .314" and a .308" would 'rattle' it's way down the barrel. Better to be absolutely sure before testing around with different sized bullets.
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02-03-2008, 05:41 PM
| #3 |
| Senior Member  Join Date: Dec 2006
Posts: 5,087
| Muddog:You can get a .308 and a .310 expander.I would ose .308,s in the ruger.They would be more accurate. sam. |
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02-03-2008, 07:46 PM
| #4 |
| Senior Member  Join Date: Mar 2002 Location: Missouri
Posts: 1,340
| I would slug the bore of your CZ or call them and ask them what bore size they use before you proceed.
__________________ Just because your paranoid doesn't mean they aren't out to get you! |
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02-04-2008, 02:18 PM
| #5 |
| Member Join Date: Nov 2007
Posts: 85
| Muddog, The AA Maunual #2 shows 25.7 to 28.5 grains of 1680 behind a Speer 100 gr, RN .308" bullet. Because the pistol bullet is likely to be softer and more easily deformed by high pressure than the Speer rifle bullet, it may create higher pressure for that reason as well as its larger diameter. So, be careful and start low. SL11 |
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02-23-2008, 05:46 PM
| #6 |
| Registered User Join Date: Feb 2008
Posts: 1
| Mini-30 Update Let me jump into this thread, although I can't help with the reloading issue: From conversations with Ruger customer service, the Mini-30 was first manufactured for use with a .308 bullet and sometime in the mid '90s re-tooled for the .310 diameter bullet. I've seen references to the reverse. The serial number of your Mini-30 can be used by a Ruger service rep to let you know what your shooting with. They can also explain the implications of using .308, .310, or .311 bullets in your particular model. Another misconception I've run in into is the 7.62x39 bullet diameter used by various manufactures, U.S. or otherwise. Here is the info I've collected thus far via e-mail exchanges with the indicated manufacturers (I've fired all of them in my Mini-30): Cor-Bon 150gr "Hunter" (Barnes TSX)= .308 Cor-Bon 123gr DPX Hunter (Barnes TSX) = .310 Federal 123gr Power-Shok = .310 HSM 123gr V-Max (via Cabela's) = .308 Fiocchi 124gr = .310 Wolf 122gr (FMJ and HP) = .308 Hope this info may be of interest. |
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