.300 Winchester Magnum vs .338 Lapua Magnum
A to-scale size comparison of the .300 Winchester Magnum and the .338 Lapua Magnum, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.300 Winchester Magnum (left) beside .338 Lapua Magnum (right), shown at the same scale.
The .300 Winchester Magnum has an overall length of about 3.34″ with a 0.309″ bullet. The .338 Lapua Magnum runs about 3.68″ on a 0.339″ bullet. That makes the .338 Lapua Magnum about 1.1x the overall length of the .300 Winchester Magnum. See the full reference for each: .300 Winchester Magnum and .338 Lapua Magnum.