I have owned a Taylor, a Remington, and a Rigby. I prefer the Taylor and the Remington. The Rigby rifles are just too chubby. A 22” barrel is just right. Loading a 400 to 2150-2200 makes either much more pleasant to shoot. For practice, Trail Boss is your friend.
No fear about head stamped brass...buy 416 Remington cases and cut shorter. 40-50 will be plenty. Have your barrel marked “416”. No problem. Mostly use 458 Winchester cases.