I wonder what the ballistics are like. If I were looking for a big heavy rifle like that, it would almost certainly be for extreme long range shooting, so I'd want a high ballistic coefficient and bullets well designed for that purpose. These bullets look relatively short, so I wonder how they travel over a distance of a mile or more. If I were interested in a rifle like that for breaking down trucks and other military equipment, I'd need that long range accuracy and a good tough bullet for that purpose.
Bottom line is that I don't understand this gun and until it becomes clearer it looks like it's just another one of those big-for-big-sake rounds.
Nothing wrong with that, and there's probably a bigger market for that than long range accuracy or equipment damage. Just nice to be clear about these things.