There is absolutely no scientific evidence that a round that headspaces on the shoulder is/will be more accurate than a rifle that headspaces on the belt. Sure some cartridges are inherently more accurate but almost any good gunsmith can make pretty much any caliber shoot. The thing with the rm is the fill ratio is outstanding with slower powders and will out perform with heavier bullets as I have witnessed. Is it lot? absolutely not! Which one would I pick? The RM as there is better brass and availbility. What benchrest shooters are shooting is irrelevant.
Frank 21 those are some nice toys. After seeing your equipments specs I think a big part of our differences is we are talking apples and oranges. My experiences are with factory 24" barrels which tend to favor the Short mags. I also closely follow the reloading manuals recommended charge weights which also tend to follow the Sammi pressure limits for the cartridges. I think those two factors probably contribute to our results varying by approx 100 FPS.
never had a rem mag, but have reloaded for them for friends and shot several. I own one 7wsm for long range shooting and one light for mountain hunting is being built. Yes I like them that much. I shoot 162 amax. Like james said if you go with a wsm get a long action and a center feed clip. If you however aren't going to be reloading they can get expensive at about $35 a box here in ND.
I have a 7mm Rem MAg I am equipping for LRH. But as I do it gets heavier and heavier. Was thinking on a Win or Sav 7mm WSM package gun for a walkin hikin backpackin rifle. It seems the WSM is pretty good compared to (my other choice) a 270 package gun. Thanks for the info all...