The Tobin I had with the sharp cones was marked Tournament. It is unclear at this time who it was produced for. It did not say Tobin on it anywhere. The Tournament marked guns are fairly common. None of my Tobin 12s were so equipped.
Speculation is the sharp forcing cones were designed to work with roll crimped ammunition, of a specific length.
I have no evidence of this theory, or, any other. They were simply there. There have been other guns from the same era that have similar forcing cones, but, there is no documentation at this time as to why.
Best,
Ted
