7mm SAUM vs .338 Lapua Magnum
A to-scale size comparison of the 7mm SAUM and the .338 Lapua Magnum, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
7mm SAUM (left) beside .338 Lapua Magnum (right), shown at the same scale.
The 7mm SAUM has an overall length of about 2.83″ with a 0.284″ bullet. The .338 Lapua Magnum runs about 3.68″ on a 0.339″ bullet. That makes the .338 Lapua Magnum about 1.3x the overall length of the 7mm SAUM. See the full reference for each: 7mm SAUM and .338 Lapua Magnum.