.300 PRC vs .416 Barrett
A to-scale size comparison of the .300 PRC and the .416 Barrett, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.300 PRC (left) beside .416 Barrett (right), shown at the same scale.
The .300 PRC has an overall length of about 3.70″ with a 0.308″ bullet. The .416 Barrett runs about 4.95″ on a 0.416″ bullet. That makes the .416 Barrett about 1.3x the overall length of the .300 PRC. See the full reference for each: .300 PRC and .416 Barrett.