I have not seen a single new cartridge after the IHMSA craze in the 70'ies.
6.5IHMSA = 6.5x47 = 6.5CM.
6mmBR/6.5BR/7BR.
Etc, etc.
The only new cartridges I know of are the defunct Voere 6mm Vec91 caseless, that was emediatly forbidden in BR comps based on Jarrett rifles prototypes that shot too...