6 Dasher vs 6 GT
A to-scale size comparison of the 6 Dasher and the 6 GT, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6 Dasher (left) beside 6 GT (right), shown at the same scale.
The 6 Dasher has an overall length of about 2.25″ with a 0.243″ bullet. The 6 GT runs about 2.64″ on a 0.243″ bullet. That makes the 6 GT about 1.2x the overall length of the 6 Dasher. See the full reference for each: 6 Dasher and 6 GT.