.30-378 Weatherby vs .338 Winchester Magnum
A to-scale size comparison of the .30-378 Weatherby and the .338 Winchester Magnum, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.30-378 Weatherby (left) beside .338 Winchester Magnum (right), shown at the same scale.
The .30-378 Weatherby has an overall length of about 3.75″ with a 0.308″ bullet. The .338 Winchester Magnum runs about 3.34″ on a 0.338″ bullet. That makes the .30-378 Weatherby about 1.1x the overall length of the .338 Winchester Magnum. See the full reference for each: .30-378 Weatherby and .338 Winchester Magnum.