6-284 Winchester vs .308 Winchester
A to-scale size comparison of the 6-284 Winchester and the .308 Winchester, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6-284 Winchester (left) beside .308 Winchester (right), shown at the same scale.
The 6-284 Winchester has an overall length of about 3.05″ with a 0.243″ bullet. The .308 Winchester runs about 2.81″ on a 0.309″ bullet. That makes the 6-284 Winchester about 1.1x the overall length of the .308 Winchester. See the full reference for each: 6-284 Winchester and .308 Winchester.