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Sectional density.
.277" (.270) 130 grain, SD .242
.277" (.270) 150 grain, SD .279
.308" (7.62mm) 150 grain, SD .226
.308" (7.62mm) 180 grain, SD .271
Put it this way, a 150gr 270 bullet has a higher sectional density than a 180gr 30 cal bullet.
You really don't need that for deer or smaller, but on elk or bear it makes a lot of sense. Also for long shots a heavy bullet with good BC is a better choice than a light bullet that "shoots flat."
Jimro
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