Woods have bulge to help correct for missing the middle. The gear effect actually helps toe-hits to draw a bit while heelies fade. It has to do with the CoG of the clubhead and the CoG of the ball and the forces applied.
I assume that irons do not have bulge because the CoG is so close to the face (which it isn't in woods), so gear effect really doesn't play a part. Either that, or the increased loft of irons makes it a moot point.
I haven't seen too many higher lofted fairway woods or hybrids with huge amounts of bulge, though.
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