It may jut be it is newer, less used and abused. My father pointed out to me once that doubles were going out of style before WWII, his friends were shooting more pumps and A5's. Their fathers were the ones most likely to be shooting doubles. And after the war nobody was interested in doubles and the decline in sales reflects this. One by one the double makes ended production or sold out to others who ended it later. Late guns saw much less use than earlier examples for reasons other than just age. No man would want to be seen as falling behind his shooting buddies because we all know the misses are in the gun not the man. New guns miss less than old guns. If you want to prove it shoot a gun you are interested in buying, you will shoot the best round of the year with that still un-bought gun.
If you think about it the double dominated shooting from about 1870 to about 1900 or as late as 1910. Then the pump guns took over with some A5 types mixed in. After the war the pumps were slowly replaced by the semi autos the by the early 60's the gas operated semi auto took over the market. Then the O/U came into heavy use. No system lasted in dominance for much over fifty years and all remained in limited production even after they faded from the top.
