6mm Creedmoor vs 6-284 Winchester
A to-scale size comparison of the 6mm Creedmoor and the 6-284 Winchester, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6mm Creedmoor (left) beside 6-284 Winchester (right), shown at the same scale.
The 6mm Creedmoor has an overall length of about 2.80″ with a 0.243″ bullet. The 6-284 Winchester runs about 3.05″ on a 0.243″ bullet. That makes the 6-284 Winchester about 1.1x the overall length of the 6mm Creedmoor. See the full reference for each: 6mm Creedmoor and 6-284 Winchester.