If you're really going to get into this, you need a copy of Bryan Litz's APPLIED BALLISTICS FOR LONG-RANGE HUNTING, partly because it includes actual range-tested BC's for a number of bullets. The Swift's BC tested at a little under .500, while the ABLR's is spot-on.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck