"The .410 shell is probably the least popular shell of the regularly produced shot shell line up. The most popular is, of course, the 12 ga. This is followed by the 20 ga. The .410 is possibly the next in popularity followed by the seldom purchased 16 and 28 ga. shells. Because the .410 shell is almost a speciality run, the prices are more for them. The same is true for the 28 and 16 ga shells. Prices are inversely proportional to the popularity and consequently the production of the shell."