Sorry for keeping you waiting. Work and a sick dog are occupying my life at the moment.
Chuck;
Chamber dia = .463"; Bore dia = .410; Difference = .053";
.053/2 =.0265"; Co-Tan 5 = 11.43
11.43 x .0265 = .3029; Exactly what is shown on the drawing.
Winner! Winner! Winner! Jack Daniels dinner!
I definitely would "NOT" call this a Long Cone.
Neither would I. Never did. You are implying I did. Your obliquity has continued.
My quote:
"It typifies the modern cone considered to be longer than many early 20th century guns."The cone length is shorter for the same angle in the .410 than in the larger gauges because there is less difference in chamber & bore diameters.
Your deductive powers are intact.
Miller,
I'll give you the benefit of the doubt. You misunderstood what I posted. If I misunderstand your intent, please continue.