Originally Posted by Camosteel
A 300wm w/ 180gr bullet will be about 150+fps faster than a 7mm w/ 175gr bullet. Not sure what that translates to in trajectory at given distances but it does show if your looking to shoot heavier bullets for the larger game mentioned the 300wm should get the nod. These numbers are based off of Nosler data.
That doesn't tell the whole story.
One, a 7mm 160gr accubond has a SD of .283 which trumps a .308" 180gr accubond with SD of .271. Means it penetrates better therorectically.
With a 7mm rem mag with a 160gr accubond launching at 2950fps drops less than a .308" 180gr accubond launching at 2950fps. Both velocities are realistic values.
The .308" 180gr accubond has a BC of .507 and the 7mm 160gr accubond has a bC of .531. Which translates to 2" gain in performance to the 7mm at 500 yards, and 23" at 1000 yards.