I have a .444 -- Winchester M94 made with synthetic stocks. I took it caribou hunting in '04, and killed a bull with a 270 gr Speer bullet. Through the ribs at 65 yards -- worked really well...
. Mine carries a 3X Leupold, and pretty consistently shoots 270 gr bullets into an inch and a half at 100 yards.
But I don't think you're supposed to shoot .44 Mag brass in a .444 -- it's not a lengthened .44 Magnum.
Great rifles and cartridges for their purpose, I think...
Dennis