.223 Remington vs .300 PRC
A to-scale size comparison of the .223 Remington and the .300 PRC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.223 Remington (left) beside .300 PRC (right), shown at the same scale.
The .223 Remington has an overall length of about 2.26″ with a 0.225″ bullet. The .300 PRC runs about 3.70″ on a 0.308″ bullet. That makes the .300 PRC about 1.6x the overall length of the .223 Remington. See the full reference for each: .223 Remington and .300 PRC.