.223 Remington vs 6mm Creedmoor
A to-scale size comparison of the .223 Remington and the 6mm Creedmoor, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.223 Remington (left) beside 6mm Creedmoor (right), shown at the same scale.
The .223 Remington has an overall length of about 2.26″ with a 0.225″ bullet. The 6mm Creedmoor runs about 2.80″ on a 0.243″ bullet. That makes the 6mm Creedmoor about 1.2x the overall length of the .223 Remington. See the full reference for each: .223 Remington and 6mm Creedmoor.