.243 Ackley Improved vs .308 Winchester
A to-scale size comparison of the .243 Ackley Improved and the .308 Winchester, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.243 Ackley Improved (left) beside .308 Winchester (right), shown at the same scale.
The .243 Ackley Improved has an overall length of about 2.71″ with a 0.243″ bullet. The .308 Winchester runs about 2.81″ on a 0.309″ bullet. The two are close in overall length. See the full reference for each: .243 Ackley Improved and .308 Winchester.