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according to the hornady site "ballistic co efficient calculations involve both shape and sectional density factors" so sd matters on the way to the target and if you cut the sd of one of your 7 mm bullets in half you would not be happy with the results.
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So to calculate the ballistic co-efficient of a bullet, you need to know the sectional density of the bullet? Looking at the equation for calculating the ballistic co-efficient below, where do you input the sectional density?
http://www.jbmballistics.com/cgi-bin/jbmbcv-5.1.cgi
Using the calculation below, try changing the bullet diameter, or the bullet weight, either of which changes the sectional density. Does it change the trajectory? Given that you don't need to know the Sectional density to calculate the B.C. or the Trajectory, the Sectional density of the unfired bullet, can't be that important.
http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi