So, I have been experimenting with loading .410 shells with 9.3x74R brass and have had good results. The one thing that I have noticed is that the loads seem very weak compared to commercial Winchester 3" hunting loads. The recoil is considerably less using my loads.
I have been using 16 grains of 2400 and around 300 grains of shot, I have tried #5 and #8. These are fired from an old Marlin 60G bolt action single shot. The loading process follows:
1) prime with large pistol primer
2) drop powder
3) seat cardboard wad, 3/8" or so thick
4) set wad with punch
5) add shot and shake to settle
6) over shot wad from primer box
7) seat with a punch
8) seal with Elmers glue
I have not shot over a chronograph yet, not a fan of shotguns near the device. But, my daughter and I have fired several and compared them to commercial shells, much less recoil and noise. I am not a regular shot shell loader, but do shoot the .410 some at various varmints that make it into the yard and are pests.
The load data came from my old Lyman loading manual, is it to conservative for modern shot guns?