I tried to compare near identical sectional densities of bullets across 6.5mm, .277 and 7mm. For near same S.D., the B.C.'s vary by a much greater percentage?!?
SO, both the .264 shooting 130gr bullet (sd=.266) vs .277 shooting a 140 gr bullet (sd=.261). Total difference in SD is only about 2% higher for the .264 YET, the .264 has about a 22% HIGHER B.C than the .277!! 0.552 vs 0.452!
The same can be said of the .284 vs the .277. Looks like the "270 anythings" are worst performers between the two. Why? I'm confused.
6.5 MM
130 gr Match Grade VLD Hunting 0.552
140 gr Match Grade VLD Hunting 0.612
270 Caliber
130 gr Match Grade VLD Hunting 0.452
140 gr Match Grade VLD Hunting 0.487
150 gr Match Grade VLD Hunting 0.531
7 MM
140 gr Match Grade VLD Hunting 0.510
168 gr Match Grade VLD Hunting 0.617
