Touch of Magic

Military small arms experts have repeatedly recommended a 7mm diameter bullet for battle rifles. For example, the M1 Garand was originally chambered for the .276 Pedersen (7 x 51 mm), the en-bloc clip holding ten of those. (When rechambered for the slightly larger .30-'06 cartridge the clip only held eight.)

Is there currently any work being done on a 7mm battle rifle cartridge?