.300 WSM vs .300 Lapua Magnum
A to-scale size comparison of the .300 WSM and the .300 Lapua Magnum, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.300 WSM (left) beside .300 Lapua Magnum (right), shown at the same scale.
The .300 WSM has an overall length of about 2.86″ with a 0.309″ bullet. The .300 Lapua Magnum runs about 3.72″ on a 0.308″ bullet. That makes the .300 Lapua Magnum about 1.3x the overall length of the .300 WSM. See the full reference for each: .300 WSM and .300 Lapua Magnum.