dB - I've never printed such heavy grain before. But as long as you take care of where your black and white points are, your shadow detail should be fine. What I mean by that is, you really never want to go to a full 0,0,0 black (or 255,255,255 white) in an image that you want to print. Doing that for a web image is fine, but doing that for prints will make you lose detail in the shadows and/or highlights. I set my black point at around 8,8,8 and my whitepoint to around 247, 247, 247.