.30-378 Weatherby vs .416 Barrett
A to-scale size comparison of the .30-378 Weatherby and the .416 Barrett, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.30-378 Weatherby (left) beside .416 Barrett (right), shown at the same scale.
The .30-378 Weatherby has an overall length of about 3.75″ 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 .30-378 Weatherby. See the full reference for each: .30-378 Weatherby and .416 Barrett.