Few care for the 6mm Remington anymore. I think it is a great cartridge.
Personally I think the 6mm Rem is a very underrated round and a bigger step up in performance from the .243 than most people think. Not that the .243 is lacking in any way. Somewhere in the velocity gap between the 2 rounds there is a threshold that is crossed. (Maybe its just me thinking too much)
This 6mm has been whacking antelope for me since high school. It's performance has been incredible.