Since you are always the first one to harassingly point out to others that this is a
traditional muzzleloading forum, I suggest you take your own advice, as the .410 is a completely modern caliber and does not deserve comment here. It was not even mentioned until after the muzzleloading era, in 1895 with the advent of smokeless powder, and was not introduced into the U.S. until 1907 in cartridge form.
If you want to talk about it, take it to the Non Muzzleloading Discussion section. It does not belong here.
Of course you'll have to pony up first and become a paying member.