I'm still kind of baffled as to why the Army picked the P320 of all available choices. The Army would be well advised to take a very hard look at its procurement policies and what happened here. This stinks up to high heaven. And maybe take a good hard look at whether they really need the XM7.
IIRC, and remeber the core of the mess. The Army wrote specs for a modular 9MM. The 9MM was a given, but the modular specs were for ONE pistol on the planet, the Sig. I never understood that either, sig was granted the contract before any testing or bids, it seemed.
Much the same with the M7 train wreck. They were hell bent on a caseless round. That seems to have fallen away, to the experimental 6.8X51. The round has an insane chamber pressure, with a noticeable weight increase and capacity. They also cut 4 inches off the test barrel for the battle rifle, so what ever the published ballistics are, they aren't carried over. 140 round battle load vs 210, with an untested sighting system, at the cost of 4 pounds (likely optimistic) rifle and ammo, that is significant.
The 6.8 may be OK, but will really shorten the life of the rifle and recoil is significantly increased as well. There are several rounds they could have gone with that are road tested, don't destroy equipment or weigh significant amounts more, while keeping the tried and true platform of the M16, and keeping the ballistics of the 308.
Sig is in someone's pocket it seems.