.243 Ackley Improved vs 6.5 Creedmoor
A to-scale size comparison of the .243 Ackley Improved and the 6.5 Creedmoor, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.243 Ackley Improved (left) beside 6.5 Creedmoor (right), shown at the same scale.
The .243 Ackley Improved has an overall length of about 2.71″ with a 0.243″ bullet. The 6.5 Creedmoor runs about 2.83″ on a 0.264″ bullet. The two are close in overall length. See the full reference for each: .243 Ackley Improved and 6.5 Creedmoor.