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The front bearings are subject to high lateral loads when turning, they are prone to going out. Rear bearings going out are a fluke.
Typically, if the grinding happens when you steer right, the left bearing is the culprit. That's if it is a bearing. If the noise disappears when riding the brakes around a corner, a wheel bearing or loose brake hardware is likely.
Make sure the P/S fluid level is a little over the mark. Low fluid is usually associated with 'groaning' noises.
Does the sound change pitch with road speed?
Does the sound change pitch with engine speed?
