.22 LR vs 7mm-300 PRC
A to-scale size comparison of the .22 LR and the 7mm-300 PRC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.22 LR (left) beside 7mm-300 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-300 PRC runs about 3.70″ on a 0.284″ bullet. That makes the 7mm-300 PRC about 3.8x the overall length of the .22 LR. See the full reference for each: .22 LR and 7mm-300 PRC.