6 GT vs .300 PRC
A to-scale size comparison of the 6 GT and the .300 PRC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6 GT (left) beside .300 PRC (right), shown at the same scale.
The 6 GT has an overall length of about 2.64″ with a 0.243″ bullet. The .300 PRC runs about 3.70″ on a 0.308″ bullet. That makes the .300 PRC about 1.4x the overall length of the 6 GT. See the full reference for each: 6 GT and .300 PRC.