.308 Winchester vs .416 Barrett
A to-scale size comparison of the .308 Winchester and the .416 Barrett, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.308 Winchester (left) beside .416 Barrett (right), shown at the same scale.
The .308 Winchester has an overall length of about 2.81″ with a 0.309″ bullet. The .416 Barrett runs about 4.95″ on a 0.416″ bullet. That makes the .416 Barrett about 1.8x the overall length of the .308 Winchester. See the full reference for each: .308 Winchester and .416 Barrett.