.22 LR vs 7mm PRC
A to-scale size comparison of the .22 LR and the 7mm PRC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.22 LR (left) beside 7mm PRC (right), shown at the same scale.
The .22 LR has an overall length of about 0.98″ with a 0.224″ bullet. The 7mm PRC runs about 3.34″ on a 0.284″ bullet. That makes the 7mm PRC about 3.4x the overall length of the .22 LR. See the full reference for each: .22 LR and 7mm PRC.