>>64257283
>>64257311
There was a pretty wide swing on the cartridge specs early in the trials.
The most powerful IIRC was a joint venture between the MARS rifle company and another smaller firearms company called Cobalt Kinetics.
The specs were 140gr@3200FPS out of a Johnson rifle styled gas assisted long recoil action and 13" barrel.
That was basically the ceiling on power to my knowledge.