I've fit 275's and 285's up front on 18x10+34 (and you're 4mm further inside at +30). I don't get any real rubbing on the wheel well or fender edge at those sizes, but it's a tight fit. I do occasionally get some rub into my front brake duct hose (which runs along the inside of the wheel well and then comes out at the suspension).
IMHO 315 on +30 might be pushing it. If it works at all, it's going to be so close that it's really going to come down to what suspension components you're running and the alignment settings, and it's hard to know how that's going to work out unless you try it on your own car.
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