7mm PRC vs .300 WSM
A to-scale size comparison of the 7mm PRC and the .300 WSM, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
7mm PRC (left) beside .300 WSM (right), shown at the same scale.
The 7mm PRC has an overall length of about 3.34″ with a 0.284″ bullet. The .300 WSM runs about 2.86″ on a 0.309″ bullet. That makes the 7mm PRC about 1.2x the overall length of the .300 WSM. See the full reference for each: 7mm PRC and .300 WSM.