.243 Ackley Improved vs .338 Lapua Magnum
A to-scale size comparison of the .243 Ackley Improved and the .338 Lapua Magnum, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.243 Ackley Improved (left) beside .338 Lapua Magnum (right), shown at the same scale.
The .243 Ackley Improved has an overall length of about 2.71″ with a 0.243″ bullet. The .338 Lapua Magnum runs about 3.68″ on a 0.339″ bullet. That makes the .338 Lapua Magnum about 1.4x the overall length of the .243 Ackley Improved. See the full reference for each: .243 Ackley Improved and .338 Lapua Magnum.