Winchester® Short Magnums: Why It’s Good To Come Up Short.
Since its inception in 2001, the Winchester Short Magnum has become the most popular caliber concept in decades. What could be better than magnum power and ballistics in short-action configurations? Rifles are lighter and easier to pack in the field, far more accurate and are quicker to cycle. — And with the addition of the new hard-hitting 325 WSM, those who actively pursue elk, moose, bear and other large game have a caliber to match the conditions. The WSM concept has simply changed the way magnum calibers are perceived. For the ultimate in efficiency, accuracy and functionality, it’s good to come up short.
The 2.86" overall length allows WSM cartridges to be used in short-action rifles. With cartridges 1/2" shorter than traditional long actions, WSM rifles offer shorter bolt throw and are lighter weight.
35° shoulder angle allows for more efficient powder burn.
More powder surface area is exposed to the firing primer, resulting in a faster, more efficient powder burn.
The short fat powder column allows powder to burn at a more uniform rate, improving accuracy and performance.