6.5 PRC vs 7mm-300 PRC
A to-scale size comparison of the 6.5 PRC and the 7mm-300 PRC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6.5 PRC (left) beside 7mm-300 PRC (right), shown at the same scale.
The 6.5 PRC has an overall length of about 2.96″ with a 0.264″ bullet. The 7mm-300 PRC runs about 3.70″ on a 0.284″ bullet. That makes the 7mm-300 PRC about 1.3x the overall length of the 6.5 PRC. See the full reference for each: 6.5 PRC and 7mm-300 PRC.