Due to a short powder column the wsm cartridge produces winmag performance withless powder.

The WSM also headspaces on the shoulder wich in theory gives it an accuracy edgde over the win mag wich headspaces on the belt.

The down fall of the WSM is that there are not to many bullets over 180 that this short case and neck will handle.

Awsome cartridge, but if you already have a 300 win mag I don' t see alot of point in replacing it with the WSM your not going to notice alot of difference, one will put down game as well as the other!!!