OneDumbG0
Find Your Own Fire
And here's another scan I thought was somewhat relevant. It looks old, but its actually after the whole 'Heroes Return' storyline. I will admit however, I don't think this is how Cap would fight Colossus. Colossus' steel form is more stronger, more durable and probably faster than Absorbing Man's form here. But I wanted to point out Cap's comment in panel three about how steel fares against his shield:
EDIT: Personally, I don't think a shield thrown at Colossus' chest would do anything. It'd bounce off. My main point in these scans is not showing Cap's thrown shield could slice Colossus in half, but I think with sufficient force, and with the right angle, he could lop off an ear or at least dent an eye. And denting an eye would most likely cause Colossus vision to suffer due to a physical stigmatism and force him out of the fight. Still, maybe 5/10 between the two...