Have now received the new Hornady .423" 400 gn DGX bullets. These seem to be a good choice for the 404 Ruger as they essentially preserve the entire case capacity to equal that of the 375 Ruger parent case. This will allow another attempt at using the 4350 powders in the 404 Ruger. Firing reports next week. Bullets in all photos are positioned at max COAL (404 Ruger = 3.420" & 404 Jeff = 3.530").
The 404 Jeffery's longer neck is better suited to accommodate the 400 gn TSX.