Ive used 444 marlin cases to build 410 ammunition , havent done any for many years , but Ive just acquired a ver nice AYA sxs in mint condition I want to reload for .In the past I just used my RCBS rockchucker press.
Cast Bullet Engineering here in Oz offer a 410 adjustable slug mould , it drpos a slug that fits inside a 410 wad ,IIRc the slug mikes out at .380" on the outer diameter. I have a mould on the way to try these out .
Kev.