7mm WSM (Winchester Short Magnum)
The 7mm WSM (Winchester Short Magnum) is a centrefire cartridge developed in partnership with Browning Arms Company and Winchester ammunition, making its debut and introduced to the shooting public in 2001. The 7mm WSM is similar to the .300 WSM with the case necked down to handle 7mm bullets. However, the distance from the case head to the datum line on the shoulder is longer for the 7mm WSM, preventing accidental chambering or firing of the 7mm bullet in 270 WSM's bore.