02-13-2016, 03:39 PM
Drift Wrote:(And while I am no physicist, I suspect the main determining factor for BC is shape (friction through the air) not mass).That may be true, but the BC will still take a significant hit from reducing mass.
IIRC, there are two, 6.5mm Lapua Scenars (or is it Sierra MatchKings?) which have identical shape and size, but differ in weight by ~15 grains, and the BC of the lighter projectile is ~10% lower than that of the heavier bullet.