6.8 Western vs .300 WSM
A to-scale size comparison of the 6.8 Western and the .300 WSM, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6.8 Western (left) beside .300 WSM (right), shown at the same scale.
The 6.8 Western has an overall length of about 2.96″ with a 0.278″ bullet. The .300 WSM runs about 2.86″ on a 0.309″ bullet. The two are close in overall length. See the full reference for each: 6.8 Western and .300 WSM.