6 GT vs .243 Winchester
A to-scale size comparison of the 6 GT and the .243 Winchester, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
6 GT (left) beside .243 Winchester (right), shown at the same scale.
The 6 GT has an overall length of about 2.64″ with a 0.243″ bullet. The .243 Winchester runs about 2.71″ on a 0.243″ bullet. The two are close in overall length. See the full reference for each: 6 GT and .243 Winchester.