This might add a little clarity. Ballistic Coefficient is related to how well a bullet travels in flight, but it also can tell you how much energy is transferred.
.357 Mag; 158 grain bullet travels at about 1200-1250 FPS and generates a B.C. of about .206
.357 Mag; 180 grain bullet travels at about 1100-1180 FPS and generates a B.C. of about .230
.40 S&W; 155 grain bullet travels at about 1100-1180 FPS, but it only generates a B.C. of about .137
.40 S&W; 180 grain bullet travels at about 850-950 FPS; but it only generates a B.C. of about .164
The B.C. of the .40 is about 2/3rds of the .357 with a comparable weight bullet.
.44 Magnum: 240 grain bullet. About 1100-1145 FPS. Generates a .205 B.C.
.44 Magnum: 300 grain bullet. About 1100-1150 FPS. Generates a .245 B.C.
.308 – Everybody’s favorite rifle round. 168 grain travels at about 2700fps. Has a B.C. of .410
HUGE difference kids. HUGE.