Depends on many things, smaller frontal area helps penetration, so 'like' constructed bullets in 6.5 and 338 w/similar SD may not be that different in penetration. Think in terms of a .177 vs. 22 cal airgun pellet....
No doubt in open terrain on extra long shots, BC is important, but should not be the only dimension used to judge a bullet's worth for ALL situations IMO.
