On paper the 7 WSM with the 162 A-Max or 175 SMK really out-performs both the 300 WM and the 300 WSM, two of my favorite calibers. ... 7mm WSM . I am a huge fan of the 300 WSM and will always be, but this 7mm is really starting to change my mind. This is to prevent the 7mm from being chambered in either of the other two WSM's. Berger Hunting VLD The Hunting Shack, Inc 406-777-2106 4406 Rathbun Lane www.thehuntingshack.com Stevensville, MT 59870 10/17/2017 .300 Win Mag vs 7mm Rem Mag Ballistics As you’d expect from the fact that the two cartridges are very similar in overall size, the ballistics of the 7mm Rem Mag and .300 Win Mag are pretty similar. In order to use the bigger high BC bullets from a magazine the WSM looses too much case capacity. 270 WSM 130 gr. while burning 10 percent less powder; cycling through shorter, lighter rifles; being inherently more accurate; recoiling less; and killing like lightning cross bred with the hammer of Thor. The 7mm WSM has a case shoulder location that is slightly longer than its 30 caliber parent or 270 caliber child. Or so goes the advertising hype. All of the WSM cartridges are based on the 404 Jeffery non-belted magnum cartridge, and have been shortened to fit a short action. $14.95 Flat rate shipping for … This short, fat case is supposed to match the ballistics of the old, long 300 Win.
If you are buying a rifle off the shelf the 7mm Remington magnum will outperform the WSM on average using hadloads and bigger bullets.

There is a significant difference in the two rounds. Mag. Berger Hunting VLD 270 WSM 150 gr. The polymer tip resists deformation, maximizes long-range performance and promotes expansion. I think it is the best 7mm out there when you consider its performance is on par with the 7mm Weatherby mag and it can be chambered for a Shorter action.
The 7 WSM offers a flatter trajectory and the high-BC bullets carry energy out to long range really well. Please note, the following information reflects the estimated average ballistics for each caliber and does not pertain to a particular manufacturer, b I built my WSM on a long action to seat the Berger 180s out where they should be. Winchester Ballistic Silvertip ammunition provides hunters immediate knockdown and extreme precision. The 300 WSM, or Winchester Short Magnum, is magic. The following ammunition cartridge ballistics information and chart can be used to approximately compare .270 Winchester vs .270 WSM Winchester Short Magnum ammo rounds. Berger Hunting VLD 7mm-08 Remington 140 gr. 7mm WSM, Bullet 175gr Hornady ELD-X, Brass Hornady, Muzzle Velocity* 2900fps, Ballistic Coefficient G1/G& .689/.347, COAL 2.860″. The WSM is an 80 grain case vs 56 for the 308.