meaning it can break easily especially under the higher pressure of the cartridges. Cartridge Family The cartridges in this family are, in order of development: Like any new case introduced, wildcatters like to see what they can do to make new cartridges. Two of the more notable children or offshoots of this case are the .325 Corbin, which is essentially an 8 mm WSSM, and the .22/40 SMc, which is essentially the .223 WSSM with an elliptical shoulder. A wildcat cartridge based on the .25 WSSM, called the .358 WSSM or .358 BFG, has similar performance to the standard .358 Winchester and .35 Whelen. Additionally, Olympic arms created the .300 OSSM, which is a 25 WSSM necked up to .308” giving performance between 30-06 and .300 Winchester Magnum. See also Winchester Short Magnum, parent cartridge. References Notes "WSM and WSSM ballistic Comparison Chart" from Browning External links WSSM Zone information about WSSM cartridges and use Cartridge families Winchester Super Short Magnum