I can't remember the exact date I left Germany, but I was there from 1980- 1984... we were on the MkV Chieftain, we still had a .50 mg fitted, a GPMG 7.62 co-axial, Laser rangefinder (prone to overheat) so we usually used the Mk I eyeball for range estimation, lol... main armament ammunition was the APDS and HESH rounds. (only got to fire live APDS in Canada).
As to APFSDS, never saw one, although the Regiment taking over from us had been training on the IFCS system (we still used 'steam gunnery') back in the UK so they were probably training for APFSDS at that stage as well.
We took over as the Medium Recce element of 5 Airborne Brigade and never saw an MBT again, but quite a lot of us became paratroopers, lol!