I'm brewing an extract version of EdWort's Robust Porter tonight (7 lbs DME to replace 2-row). I got all the steeping grains yesterday, but was in a rush and didn't get them milled. I'm going to use the rolling pin/ziploc bag method and was wondering how fine i should be trying to get the grains. I've never really looked at milled grains closely. Should I be shooting to split them in half? fourths? I've also never used flaked barley, I'm assuming there's no need to crush this, it just goes straight into the grain bag?
Bottled: ESB, Belgian Pale, Belgian Dubbel, Pumpkin Ale, Vanilla Bourbon Porter, Chile Pepper Porter