With the 160 grain Sierra bullets the 7WSM is 100 fps behind the 7MM Rem Mag and 250 fps behind the 7 MM STW. With heavier bullets the WSM bullets have to be seated to a depth that won't allow enough powder to compete with the bigger 7"s. Several of my reloading manuals list this as a problem for the WSM with heavy bullets. With lighter bullets it can equal the other 7's