I was in the Air Cadets between 89 to 93. We used bolt action 22s on our own tunnel range. We had decommissioned 303 Lee-Enfields for dry rifle training. I fired an L98 once on Annual Camp (possibly RAF Witton in 92) and remember it had rather more kick than the little 22s!
They told us the Lee-Enfields had to be decommissioned as 22s were one thing, but heavy bore weapons like the .303’s getting stolen would have been quite serious!