Had many hard recoiling rifles over the years. At least 3 375 H&Hs, 2 458 WinMags. Still have one of the 458 WM. That is why I am fighting some spine issues now.
The only way I can afford to shoot them is because I cast/reload. Each factory 577 TRex round $60 to $100 dollars. Each factory 600 Nitro round is somewhere around $130 - $150 ea.
Interesting that the hot gasses enter behind the bullet because of the vacuum and are still expanding.