Stephen.
I just checked my book to see what I have used in the 19 ROT .44-77.
I have not set the mould for 405 gr, I stopped at 425 gr that made it 1.200" and it was cast with the cup based base plug to give it a little more length than a flat base. It was cast with 1/30 alloy and loaded with 77 grains of 2F OE patched to .336". I have it noted that it was very good at 200 yards using barrel sights and the soft lead blew the bowling pin apart after 4 hits.
I also used that bullet when Robert Bryan delivered the rifle to me at the Q but the load was 74 grains of 2F Goex express and it held the 400 yard diamond.......that put a smile on my face for the first time shooting the rifle

Since I switched to the 485 gr with a flat base plug I made for the Buff hunts. I wanted a little more weight for those tough critters.
The cup base needed the patch tail twisted and tucked into the cup to protect the thin shallow skirt to get the best accuracy using them.
Kurt