6 GT vs 28 Nosler
A to-scale size comparison of the 6 GT and the 28 Nosler, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6 GT (left) beside 28 Nosler (right), shown at the same scale.
The 6 GT has an overall length of about 2.64″ with a 0.243″ bullet. The 28 Nosler runs about 3.34″ on a 0.284″ bullet. That makes the 28 Nosler about 1.3x the overall length of the 6 GT. See the full reference for each: 6 GT and 28 Nosler.