7mm SAUM vs .300 WSM
A to-scale size comparison of the 7mm SAUM and the .300 WSM, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
7mm SAUM (left) beside .300 WSM (right), shown at the same scale.
The 7mm SAUM has an overall length of about 2.83″ with a 0.284″ bullet. The .300 WSM runs about 2.86″ on a 0.309″ bullet. The two are close in overall length. See the full reference for each: 7mm SAUM and .300 WSM.