FWIW, my 1913 loves R50.Nice find. I bought one last year also, 1971 was the year of manufacture. Just waiting to get mine back from the gun smith, it will be wearing a new Lilja barrel. The old barrel had damaged rifling about 6" back from the crown. It's been a long wait, almost 5 months from Lilja and now the gun smith. I will also use SK Standard Plus and I'm going to try some RWS R50.