It’s funny I remember this from my time in Sea Cadets. We used CNo7 every Friday night. I remember you would have to pluck the spent round out of the chamber about 50% of the time. I never thought of it as an issue. We were trained to just remove the round and insert the next. We didn’t use the .22 magazine follower and the spent round just dropped into the magazine casing. If I could only go back in time! CN0.7’s and C1A1’s. Life was good.