.223 Remington vs 6-284 Winchester
A to-scale size comparison of the .223 Remington and the 6-284 Winchester, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.223 Remington (left) beside 6-284 Winchester (right), shown at the same scale.
The .223 Remington has an overall length of about 2.26″ with a 0.225″ bullet. The 6-284 Winchester runs about 3.05″ on a 0.243″ bullet. That makes the 6-284 Winchester about 1.3x the overall length of the .223 Remington. See the full reference for each: .223 Remington and 6-284 Winchester.