Not necessarily sabot, though most likely a hypervelocity kinetic energy AP penetrator of some sort rather than a HEAT warhead. But it's possible that some sort of self-forging penetrator that achieves its velocity and shape from an in-flight explosion to achieve high velocities is at work. How long you figure it took the lads to get the battalion CBR NCO/officer to go over that thing with a Geiger counter to make sure it wasn't a depleted uranium slug- in which case, we'd have never read this story?
And if an MI ain't good enough, time to dismount - we will never field anything heavier.
But we may see a change from passive armoring systems to reactive measures that intercept oncoming projectiles. I wonder how the Russian Arena protective system for armored vehicles works against projectiles impacting at ± 10,000 feet per second....
-archy-/-