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I do not know but according to this article by Jim Clark, the barrel was not accurate with his loads and too light?Why was the tapered barrel found to be less than ideal? With that much barrel and the 45acp cartridge, I wouldn't think heat build up would lead to inaccuracy, especially considering you have to stop to reload every 6 rounds
According to the article, the Model 1955 corrected the problems and his reloads were now accurate! I find that hard to believe as the rifling specifications for the Model 1955 and the Model 1950 are identical and the same as specified by the Army for the Model 1917. S&W eventually changed the rifling but I am not sure the exact year, sometime in this century. Supposedly to make it more friendly to cast bullets. But as you can read, Clark and other competitors were happy with the cast bullet performance.
Kevin