.300 WSM vs 30 XC
A to-scale size comparison of the .300 WSM and the 30 XC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.300 WSM (left) beside 30 XC (right), shown at the same scale.
The .300 WSM has an overall length of about 2.86″ with a 0.309″ bullet. The 30 XC runs about 4.21″ on a 0.308″ bullet. That makes the 30 XC about 1.5x the overall length of the .300 WSM. See the full reference for each: .300 WSM and 30 XC.