I have shot many .44cal bullets in my .50cal .430 Hornady - .429 Speer - .429.5 Sierra all 300gr and they shot very well I use the Harvester Green Crush Rib sabots with these bullets .

Another one you can try is the .452 300gr Speer Gold Dot in the 454 Casual it is a bonded bullet and dose a super job with 110gr of 777 .

Again Congrats on the KNIGHT
Ron