6.5 PRC vs .416 Barrett
A to-scale size comparison of the 6.5 PRC and the .416 Barrett, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6.5 PRC (left) beside .416 Barrett (right), shown at the same scale.
The 6.5 PRC has an overall length of about 2.96″ with a 0.264″ bullet. The .416 Barrett runs about 4.95″ on a 0.416″ bullet. That makes the .416 Barrett about 1.7x the overall length of the 6.5 PRC. See the full reference for each: 6.5 PRC and .416 Barrett.