While I remember seeing billboards in the early 1980's, along Alabama Interstate Highways, touting Federal's then new Premium Buckshot with "copper plating and spiral stacking for improved patterns" for deer hunting, marketing to that hunter segment appears to have faded.
Perhaps the marketing departments are fearful of:
-Regional association with dog hunting for deer. Dog hunting for deer is slowly declining in the South due to changing patterns of land ownership and remains a controversial topic in other regions.
-Continued sporting press reference to Buckshot as an ineffective tool for deer hunting (based on the collective memory of pre-1963 ammunition performance).
-Continued shooting press focus on buckshot as only suitable for defensive use at very short range.
-Hunter distain based on lack of direct experience and decades of game laws prohibiting buckshot in many areas. (Many hunting forums degenerate into name calling when buckshot is mentioned in conjunction with deer hunting).
-Historical association in the Northeastern states with market hunting, (with dogs), and the practice of indiscriminate shooting into groups of deer.
-Mixed positions on the issue of buckshot and hunter safety from agencies like the Corps of Engineers and other public land management areas - as previously mentioned in this thread.
As a result the market focus is directed toward buckshot for defensive use, 3 gun competition and predator hunting.
The use of buckshot for coyote hunting (particularly in the Eastern U.S.) does not carry negative historical baggage so that market segment is openly catered to and covered by the shooting/hunting media.
Remember, most states prohibited archery and handgun hunting into the 1960's due to concerns over inordinate wounding, inadequate range and negative public perception. We don't see that today.