.243 Ackley Improved vs .416 Barrett
A to-scale size comparison of the .243 Ackley Improved and the .416 Barrett, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.243 Ackley Improved (left) beside .416 Barrett (right), shown at the same scale.
The .243 Ackley Improved has an overall length of about 2.71″ with a 0.243″ bullet. The .416 Barrett runs about 4.95″ on a 0.416″ bullet. That makes the .416 Barrett about 1.8x the overall length of the .243 Ackley Improved. See the full reference for each: .243 Ackley Improved and .416 Barrett.