7mm PRC vs .308 Winchester
A to-scale size comparison of the 7mm PRC and the .308 Winchester, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
7mm PRC (left) beside .308 Winchester (right), shown at the same scale.
The 7mm PRC has an overall length of about 3.34″ with a 0.284″ bullet. The .308 Winchester runs about 2.81″ on a 0.309″ bullet. That makes the 7mm PRC about 1.2x the overall length of the .308 Winchester. See the full reference for each: 7mm PRC and .308 Winchester.