Thread: 300 wsm vs 300 win mag at 22 inches

Originally Posted by McNotty

Mark and Sam in Aussie have found short and fat beats long and skinny (stop it you sickos) in the testing they’ve done, admittedly not very scientific but they test quite a few different calibres at ridiculous ranges. Just the other day they were poking out 220gr from 300wsm at 2950, barrel wasn’t crazy long at 27”

The data I have says the 'short and fat' 300WSM has no velocity difference over the 'long and slender' 300 H&H (similar 300WM).

February 2007, No 245 on pages 95, 96 and 97 of 'Handloader' Magazine:

The 300 H&H and 300 WSM have virtually the same case capacity. Both chambers were given the same amount of throat.

Using the 180 grain Nosler Partition:
.300 WSM RL-19 at 67.0 grains gave 2,918 fps at 56,064 psi Velocity spread 13 fps.

.300 H&H Rl-19 at 67.0 grains gave 2,914 fps at 57,177 psi, Velocity spread 9 fps."