The wsm cartridges are very good performers,but contrary to browning and winchester advertising, they do not offer performance advantages over the standard mags.The advertising skewed the ballistics by using very mild loads and bullets with lesser ballistic co-efficients for the standard mags,to make it look as though the wsms provided more velocity and a flatter trajectory.I have done a few chronograph comparisons of the 7mmremmag and 7mmwsm and the 300wsm and 300wsm and in fact the 7mm remmag and 300winmag provide slightly more velocity.The 300wsm is selling quite well in my area,with the 270wsm selling not nearly as well,but the 7mmwsm is suffering badly in sales for some reason.Unless sales increase the 7mmwsm may not survive long.