I had an opportunity to examine a 52 pre A and 52B recently for sale. I realized how little I knew about these guns. I came back to this forum and also did a quick read a wiki pedia.
I think I have a general handle on triggers, actions, and stocks. What I have not found are reference to how the barrel making may have evolved over time.
Specifically were all 52 choke or taper bored? Or when did that start?
Logically, I would expect a lot more care into an Olympic grade E than a sporter. How does a D compare to a B? Or, exactly what models and when are the key differences in boring and chambering barrels?