Doubleman and Ahsan;
It's funny how shooting habits vary with location. Out here the sharptail is a big hardy bird with a large heart, tough to kill cleanly. They are spooky and a 30 yard shot is a gift. I would never consider using a .410 for them in this neck of the woods. I don't even use 28 gauge for sharptail, and consider the 2 1/2 inch 20 gauge with 7/8 oz. of shot as the minimum effective load.
I have been known to use .410 for ruffed grouse, employing an AYA #3 and Gamebore 2 1/2" shells with #7 1/2 shot. It is a guilty pleasure carrying such a lightweight gun and ammunition, and it is certainly rewarding to have a successful hunt with that combination. Overall, though, I prefer the 28 gauge with 3/4 oz. loads for such use as the patterns are much more reliable and the total weight (gun + ammunition) is only slightly higher than the .410.
For clays with the .410 I cheat a little bit and use a big ugly Baikal 43 with a single trigger. It is a 7 lb. gun and feels more like 8. The only shells it seems to like are Remington 3 inch loads. The gun shoots high, which makes it perfect for wobble (continental) trap. I have found than nobody likes to get beat at wobble trap by someone using a .410! Knowing where it shoots allows me to use it for sporting clays as well, but only for fun.
I guess that is the nature of the .410 - it is a very entertaining load. It is enjoyable to use for hunting as long as you respect the limitations of the load and your skills, and it is fun and challenging to shoot clays with. Add to that some utility for pest control and you have the reason why the .410 has survived.
Sharptail