.300 Norma Magnum vs .30-378 Weatherby
A to-scale size comparison of the .300 Norma Magnum and the .30-378 Weatherby, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.300 Norma Magnum (left) beside .30-378 Weatherby (right), shown at the same scale.
The .300 Norma Magnum has an overall length of about 3.68″ with a 0.308″ bullet. The .30-378 Weatherby runs about 3.75″ on a 0.308″ bullet. The two are close in overall length. See the full reference for each: .300 Norma Magnum and .30-378 Weatherby.