I also live in California, and I recently bought a Mini-14 Ranch Rifle. I like it, but I think you can make a good case for the Mini-30 as well. A couple of points:
- People (including me) tend to think the 7.62x39 is cheaper than .223. That's true if you are comparing Wolf or other cheap, steel cased 7.62 with brass cased, reloadable .223 (which most people prefer for their ARs, etc.). But if you compare Wolf or other really low-end .223, I don't think there is much of a price difference.
- I suspect that much of the reason the Russians and others have gone to smaller calibers is because they recoil less, making them more controllable in full-auto fire. That doesn't apply here. Ammo is also obviously lighter, but I don't think this is a big issue to most people (unless you plan to carry several hundred rounds). In a really accurate rifle (good AR, for example), the flat-shooting .223 would have an advantage at longer ranges, but I think both the Minis are short to medium range rifles, so I don't see much advantage to the .223.
- The 7.62x39 would be legal for deer hunting if you ever wanted to use it for that.
- I read here somewhere that Mec-Gar is now making good 10-round magazines for the Mini-14 and 30. I don't know where to get them, but this sounds encouraging. I think a 10-round magazine would be about right for the Mini-30, and okay for the Mini-14.
I don't think you'll go far wrong with either choice.
Doug