7mm-300 PRC vs .416 Barrett
A to-scale size comparison of the 7mm-300 PRC and the .416 Barrett, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
7mm-300 PRC (left) beside .416 Barrett (right), shown at the same scale.
The 7mm-300 PRC has an overall length of about 3.70″ with a 0.284″ 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 7mm-300 PRC. See the full reference for each: 7mm-300 PRC and .416 Barrett.