what makes good dies?
ideally they should size cases straight, and seat bullets straight.
for hunting rifles, full length sizing of cases is a given.
both to keep shoulder bumped to the correct headspace, and with this body dimensions for reliable chambering of rounds.
the problem with this is that if you have a large chamber and a tight die, case life becomes an issue, to the point of being dangerous.
the ideal fls die situation comes when you have a custom chamber done, with a chambering reamer, and you also have a die reamer to match the chambering reamer.
this die will size your cases to 0.003" under chamber size when correctly adjusted for headspace.
your gunsmith will make a die blenk and chamber it with the reamer, or access die blanks from nulon or pacific tool and gauge.
the seating die is chambered with the same reamer used to chamber the barrel, again in a die blank.
the sizing die should ideally be hardened to minimize wear.
all the other bells and whistles are nice to have, but not as necessary as the abovementioned.
rather than you beaut seating depth adjusters, making the sizing die that takes neck bushings can be of great value in that you can optimize neck tension while minimally working the brass.
bushings to suit 404 might need to be custom made.
could be ch4d will custom make sizing dies to suit your chamber if you send them some fired cases.
bruce.