I run Wolf 7.62x39 through my Mini-30 and have yet to experience any problems as a result. Accuracy is fine to boot.
+1. I've used both the polymer HP 122-grain and the polymer FMJ 122-grain, and although both shoot fine out of my Mini-30, the HP seems more accurate. It's all I use now in my Mini-30, and I bust clays at 100 yards using iron sights.
Wolf ain't target match stuff, but once I zeroed my Mini at 100 yards, I get one-shot one-clay, so it's accurate enough for my purposes.
The only problem I have are the occasional hard primer, 1 in 10 rounds. However, I don't think that will be a problem with an SKS.