British APDS issues

Is anyone else having major inconsistencies with the Cent mk1 APDS? Last night I had 2 clear examples of shells that either shattered on flat surface, or were just absorbed by a turret ring.

Shot a tiger 2 in the front sprocket (side skirt) that was sticking out of the corner, maybe 200M away at less than 10 degrees, and the APDS shell shattered, doing no damage.

A few matches later, I shoot the side of an IS2 turret, at the turret ring. Shell penned, but only took out the ring, with no spall/crew damage.

And yet, other times I can pen the upper plate of a panther 2 at 500m without issues.