Brings back memories...
I was taught to shoot on Lee-Enfields back in my air cadet days, .22 and .303. We were lucky, our unit had an indoor range on site so I got quite a lot of time on the .22s.
I got pretty good, but that was 30 years ago.
The SLR was introduced in 1955? I got to fire those too, and I thought they were bang up-to-date in the '80s. Heh.