.22 LR vs .223 Remington
A to-scale size comparison of the .22 LR and the .223 Remington, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.22 LR (left) beside .223 Remington (right), shown at the same scale.
The .22 LR has an overall length of about 0.98″ with a 0.224″ bullet. The .223 Remington runs about 2.26″ on a 0.225″ bullet. That makes the .223 Remington about 2.3x the overall length of the .22 LR. See the full reference for each: .22 LR and .223 Remington.