.223 Remington vs 7mm SAUM
A to-scale size comparison of the .223 Remington and the 7mm SAUM, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.223 Remington (left) beside 7mm SAUM (right), shown at the same scale.
The .223 Remington has an overall length of about 2.26″ with a 0.225″ bullet. The 7mm SAUM runs about 2.83″ on a 0.284″ bullet. That makes the 7mm SAUM about 1.3x the overall length of the .223 Remington. See the full reference for each: .223 Remington and 7mm SAUM.