.22 LR vs .243 Ackley Improved
A to-scale size comparison of the .22 LR and the .243 Ackley Improved, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.22 LR (left) beside .243 Ackley Improved (right), shown at the same scale.
The .22 LR has an overall length of about 0.98″ with a 0.224″ bullet. The .243 Ackley Improved runs about 2.71″ on a 0.243″ bullet. That makes the .243 Ackley Improved about 2.8x the overall length of the .22 LR. See the full reference for each: .22 LR and .243 Ackley Improved.