Just because one rifle in 7MM WSM shoots tiny groups does not by any means mean that the next one will. Accuracy is built into the rifle not the caliber. The 7MM WSM will always lag behind the standard 7MM Mags because it does not have the powder capacity of the larger 7 Mags. It will do well with the lighter bullets but you can't defy physics. There is a trade off for the short case. Heavier bullets have to be seated to deep in order to work and that robs the WSM of powder capacity. The reloading manuals point that out and the 7MM WSM is the most effected. I don't know why unless its that the 284 caliber bullets are long. Anyway my manuals state that this is one of the reasons that the 7MM WSM is lagging badly in sales when compared to the 270 and 300 WSM's. The 270 and 300 WSM's are here to stay but I think the 7 is on its way out. Only time will tell. Were I to need a 7 Mag, I would go with the Remington Mag.

Winchester has done a good job of hyping the short mag and there is nothing wrong with them as long as one realizes that there is, as always, a trade off. They do all they can with what they have but will never equal the long versions when it comes to heavy bullets. Also the 300 Win Mag is one of the most accurate cartridges ever developed and rifles in that caliber do not take a back seat to the the stubbies. If more power is needed the 300 Win Mag would be the better choice. It has more power. Still need MORE? the 30-378 and 300 RUM have even more yet. Be sure that recoil is not an issue here though.