.300 WSM vs .300 PRC
A to-scale size comparison of the .300 WSM and the .300 PRC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.300 WSM (left) beside .300 PRC (right), shown at the same scale.
The .300 WSM has an overall length of about 2.86″ with a 0.309″ bullet. The .300 PRC runs about 3.70″ on a 0.308″ bullet. That makes the .300 PRC about 1.3x the overall length of the .300 WSM. See the full reference for each: .300 WSM and .300 PRC.