You might want to be a bit more specific as to which specific mould that you just bought and what powders that you might have on hand or prefer … I.E. the projected cast weight …
Also what wads or spacers that you may, or may not have… to assemble your 410 loads with…
That might help the membership to come up with some load data …
Finally … have you gone to Loaddata and typed in .410 in the shotgun section, & the projectile weight etc… to see what might come up?
Shotguns are not like handguns and rifles… you need to follow the load recipe exactly… also I might recommend a shotgun reloading manual or two to cross check the data…
Lastly … Even if you don't have a subscription to the loaddata data base … you can still see what might come up sans the powder or powders amount … for ideas to help you pick a direction …
BPI Thug-slug recipe 2.5” Cheddite hull, fold crimp` Ch209 primer 10 gr Unique powder One “Thug-slug” (125 grains) 1505 fps
2.5” Fiocchi hull, fold crimp Fio 616 primer 10 gr Blue Dot powder MG410 wad ½ oz. lead shot (recommend 7-1/2) 1200 fps
2.5” Winchester AA HS hull, fold crimp Win 209 primer 13 gr Hodgdon Lil Gun powder Winchester or Claybuster wad ½ oz. lead shot Velocity not listed
2.5” Winchester AA HS hull, fold crimp Win 209 primer 15.5 gr Hodgdon H-110 or Winchester 296 powder Winchester or Claybuster wad ½ oz. lead shot 1200 fps