I am not a 410 only user, but, when it comes to shotguns, I am a 410 primarily. I have used a 410 since 1957, and very successfully.
On shotgunworld.com, there is a gent who uses the handle of kachbr. He got a 410 when he was 9 years old around 1969, or so, and has used nothing else, period, since. He has some really expensive and semi custom 410's and has taken everything including turkey, goose, and duck.
I do not take squirrel or rabbit with any shotgun.
I have taken all the upland birds. A 410 was my very favorite grouse gun. I couldn't count the crows and barn pigeons.
I started reloading the 3 inch 410 in 1964 I think it was. When I found out Remington was going to discontinue the special SP4103 wads for loading 3 inch shells, I bought all I cound find, thousands of them. I reload with magnum grade hard shot and was able to get a supply of some West Coast copper plated magnum shot. Loaded with the full 3 inch shotcup and hard shot, the 410 is a very effective shotgun when used within its 25 yard range.
The 410 is pattern tested at 25 yards in a 25 inch circle rather than at 40 yards in a 30 inch circle. Get a mindset that the 410 stops at 25 yards and is no larger than 25 inches at that 25 yards, and the 410 can do.
I stopped hunting in 2005 and gave all my guns to my 4 gandsons and 2 grandaughters. The two older grandsons also got the reloading equipment for rifle, handgun, and shotgun. I kept, for myself, one very special shotgun, a 410. It has a custom stock and forearm and has had some choke work done. A very effective litttle gun.