7mm SAUM vs 7mm-300 PRC
A to-scale size comparison of the 7mm SAUM and the 7mm-300 PRC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
7mm SAUM (left) beside 7mm-300 PRC (right), shown at the same scale.
The 7mm SAUM has an overall length of about 2.83″ with a 0.284″ bullet. The 7mm-300 PRC runs about 3.70″ on a 0.284″ bullet. That makes the 7mm-300 PRC about 1.3x the overall length of the 7mm SAUM. See the full reference for each: 7mm SAUM and 7mm-300 PRC.