7mm PRC vs .416 Barrett
A to-scale size comparison of the 7mm PRC and the .416 Barrett, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
7mm PRC (left) beside .416 Barrett (right), shown at the same scale.
The 7mm PRC has an overall length of about 3.34″ with a 0.284″ bullet. The .416 Barrett runs about 4.95″ on a 0.416″ bullet. That makes the .416 Barrett about 1.5x the overall length of the 7mm PRC. See the full reference for each: 7mm PRC and .416 Barrett.