There have been discussions in the past about the comparison between the .357 Magnum and the .30 Carbine cartridges. The comparisons have all included .357 magnum pistol velocities though. Well I did some research and got the ballistics for commercial .357 Magnum ammunition fired from a rifle.

The results are:

. 357 Magnum Rifle M.V. 1830 fps 100 yds 1427 fps 200 yds 1138 fps
158 gr. soft point M.E. 1175 fp 715 fp 458 fp

.30 Carbine M.V. 1990 fps 1567 fps 1236 fps
110 Gr soft point M.E. 967 fp 600 fp 373 fp

The .30 Cal carbine does have a noticibly flatter trajectory, but not enough to make a huge difference until you pass 200 yards

In other words the two cartridges are more or less equivalent.
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